View Filing Data

(488)

(415)

(1,057)

^[1]

(337)

(282)

(670)

Amortization expense

(55)

(50)

(108)

(880)

(747)

(1,835)

173

(23)

(24)

(36)

(72)

Other expense, net

(6)

(19)

(2)

(19)

(3)

(71)

Less: Income attributable to noncontrolling interest

(1)

(2)

(1)

(3)

Net income (loss) attributable to Warner Music Group Corp.

$ (3)

$ 19

$ 1

[1]	(a) Includes depreciation expense of: $(14) $(13) $(26) $(25)

Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Depreciation expense	$ (14)	$ (13)	$ (26)	$ (25)

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (1)	$ 20	$ 4	$ 44
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	9	24	18	(13)
Deferred gains (losses) on derivative financial instruments	1	1	2	(1)
Other comprehensive income (loss), net of tax	10	25	20	(14)
Total comprehensive income	9	45	24	30
Less: Income attributable to noncontrolling interest	(2)	(1)	(3)	(3)
Comprehensive income attributable to Warner Music Group Corp.	$ 7	$ 44	$ 21	$ 27

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 4	$ 44
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	134	126
Unrealized losses (gains) and remeasurement of foreign denominated loans	11	(1)
Deferred income taxes	38	(12)
Loss on extinguishment of debt	24	32
Net (gain) loss on divestitures and investments	(7)	6
Non-cash interest expense	3	5
Equity-based compensation expense	27	17
Changes in operating assets and liabilities:
Accounts receivable	(15)	(41)
Inventories	1	3
Royalty advances	(12)	1
Accounts payable and accrued liabilities	(100)	(43)
Royalty payables	68	75
Accrued interest	(14)	7
Deferred revenue	(16)	(4)
Other balance sheet changes	(10)	11
Net cash provided by operating activities	136	226
Cash flows from investing activities
Acquisition of music publishing rights, net	(5)	(6)
Capital expenditures	(29)	(18)
Investments and acquisitions of businesses, net	(6)	(6)
Proceeds from the sale of investments	12	18
Net cash (used in) provided by investing activities	(28)	(12)
Cash flows from financing activities
Proceeds from supplement of Acquisition Corp. Senior Term Loan Facility	320	22
Call premiums paid on and redemption deposit for early redemption of debt	(23)	(27)
Deferred financing costs paid	(9)	(12)
Distribution to noncontrolling interest holder	(2)	(1)
Dividends paid	(125)	(54)
Net cash (used in) provided by financing activities	(149)	(93)
Effect of exchange rate changes on cash and equivalents	6	(4)
Net (decrease) increase in cash and equivalents	(35)	117
Cash and equivalents at beginning of period	647	359
Cash and equivalents at end of period	612	476
4.125% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp		380
4.875% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp		250
5.50% Senior Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp	325
6.00% Senior Secured Notes
Cash flows from financing activities
Repayment of Senior Secured Notes		(450)
6.25% Senior Secured Notes
Cash flows from financing activities
Repayment of Senior Secured Notes		(173)
5.625% Senior Secured Notes
Cash flows from financing activities
Repayment of Senior Secured Notes		$ (28)
6.75% Senior Notes
Cash flows from financing activities
Repayment of and redemption deposit for Acquisition Corp. 6.75% Senior Notes	$ (635)

Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)	Mar. 31, 2018	Mar. 31, 2017
4.125% Senior Secured Notes
Interest rate	4.125%	4.125%
4.875% Senior Secured Notes
Interest rate	4.875%	4.875%
5.50% Senior Notes
Interest rate	5.50%	5.50%
6.00% Senior Secured Notes
Interest rate	6.00%	6.00%
6.25% Senior Secured Notes
Interest rate	6.25%	6.25%
5.625% Senior Secured Notes
Interest rate	5.625%	5.625%
6.75% Senior Notes
Interest rate	6.75%	6.75%

Consolidated Statement of Equity (Unaudited) - 6 months ended Mar. 31, 2018 - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total Warner Music Group Corp. Equity	Noncontrolling Interest
Beginning balance at Sep. 30, 2017	$ 308		$ 1,128	$ (654)	$ (181)	$ 293	$ 15
Beginning balance, shares at Sep. 30, 2017	1,052	1,055
Net income (loss)	$ 4			1		1	3
Dividends	(125)			(125)		(125)
Other comprehensive income, net of tax	20				20	20
Distribution to noncontrolling interest holders	(2)						(2)
Other		(3)
Ending balance at Mar. 31, 2018	$ 205		$ 1,128	$ (778)	$ (161)	$ 189	$ 16
Ending balance, shares at Mar. 31, 2018	1,052	1,052

Description of Business	6 Months Ended
Description of Business	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	1. Description of Business Warner Music Group Corp. (the “Company”) was formed on November 21, 2003. The Company is the direct parent of WMG Holdings Corp. (“Holdings”), which is the direct parent of WMG Acquisition Corp. (“Acquisition Corp.”). Acquisition Corp. is one of the world’s major music-based content companies. Acquisition of Warner Music Group by Access Industries Pursuant to an Agreement and Plan of Merger, dated as of May 6, 2011 (the “Merger Agreement”), by and among the Company, AI Entertainment Holdings LLC (formerly Airplanes Music LLC), a Delaware limited liability company (“Parent”) and an affiliate of Access Industries, Inc. (“Access”), and Airplanes Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Merger Sub”), on July 20, 2011 (the “Merger Closing Date”), Merger Sub merged with and into the Company with the Company surviving as a wholly owned subsidiary of Parent (the “Merger”). In connection with the Merger, the Company delisted its common stock from the NYSE. The Company continues voluntarily to file with the SEC current and periodic reports that would be required to be filed with the SEC pursuant to Section 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) as provided for in certain covenants contained in the agreements governing its outstanding indebtedness. Recorded Music Operations The Company’s Recorded Music business primarily consists of the discovery and development of artists and the related marketing, distribution and licensing of recorded music produced by such artists. The Company plays an integral role in virtually all aspects of the recorded music value chain from discovering and developing talent to producing music and promoting artists and their products. In the United States, Recorded Music operations are conducted principally through the Company’s major record labels— Warner Bros. Records and Atlantic Records. The Company’s Recorded Music operations also include Rhino, a division that specializes in marketing the Company’s music catalog through compilations and reissuances of previously released music and video titles. The Company also conducts its Recorded Music operations through a collection of additional record labels, including Asylum, Big Beat, Canvasback, East West, Elektra, Erato, FFRR, Fueled by Ramen, Nonesuch, Parlophone, Reprise, Roadrunner, Sire, Spinnin’, Warner Classics and Warner Music Nashville. Outside the United States, Recorded Music activities are conducted in more than 50 countries through various subsidiaries, affiliates and non-affiliated licensees. Internationally, the Company engages in the same activities as in the United States: discovering and signing artists and distributing, marketing and selling their recorded music. In most cases, the Company also markets and distributes the music of those artists for whom the Company’s domestic record labels have international rights. In certain smaller markets, the Company licenses the right to distribute the Company’s records to non-affiliated third-party record labels. The Company’s international artist services operations include a network of concert promoters through which it provides resources to coordinate tours for the Company’s artists and other artists as well as management companies that guide artists with respect to their careers. The Company’s Recorded Music distribution operations include Warner-Elektra-Atlantic Corporation (“WEA Corp.”), which markets and sells music and video products to retailers and wholesale distributors; Alternative Distribution Alliance (“ADA”), which distributes the products of independent labels to retail and wholesale distributors; and various distribution centers and ventures operated internationally. In addition to the Company’s Recorded Music products being sold in physical retail outlets, Recorded Music products are also sold in physical form to online physical retailers such as Amazon.com and bestbuy.com and in digital form to an expanded universe of digital partners, including digital streaming services such as Amazon, Apple Music, Deezer, Napster, Soundcloud, Spotify and YouTube, digital radio services such as iHeart Radio, Pandora and Sirius XM and digital download services such as Apple’s iTunes and Google Play. The Company has integrated the exploitation of digital content into all aspects of its business, including artist and repertoire (“A&R”), marketing, promotion and distribution. The Company’s business development executives work closely with A&R departments to ensure that while music is being produced, digital assets are also created with all distribution channels in mind, including streaming services, social networking sites, online portals and music-centered destinations. The Company also works side by side with its online and mobile partners to test new concepts. The Company believes existing and new digital businesses will be a significant source of growth and will provide new opportunities to successfully monetize its assets and create new revenue streams. The proportion of digital revenues attributed to each distribution channel varies by region and proportions may change as the roll out of new technologies continues. As an owner of music content, the Company believes it is well positioned to take advantage of growth in digital distribution and emerging technologies to maximize the value of its assets. The Company has diversified its revenues beyond its traditional businesses by entering into expanded-rights deals with recording artists in order to partner with artists in other aspects of their careers. Under these agreements, the Company provides services to and participates in artists’ activities outside the traditional recorded music business such as touring, merchandising and sponsorships. The Company has built artist services capabilities and platforms for exploiting this broader set of music-related rights and participating more widely in the monetization of the artist brands it helps create. The Company believes that entering into expanded-rights deals and enhancing its artist services capabilities in areas such as concert promotion and management have permitted it to diversify revenue streams and capitalize on other revenue opportunities. This provides for improved long-term relationships with artists and allows the Company to more effectively connect artists and fans. Music Publishing Operations While recorded music is focused on exploiting a particular recording of a composition, music publishing is an intellectual property business focused on the exploitation of the composition itself. In return for promoting, placing, marketing and administering the creative output of a songwriter, or engaging in those activities for other rightsholders, the Company’s Music Publishing business garners a share of the revenues generated from use of the composition. The Company’s Music Publishing operations are conducted principally through Warner/Chappell, its global Music Publishing company, headquartered in Los Angeles with operations in over 50 countries through various subsidiaries, affiliates and non-affiliated licensees. The Company owns or controls rights to more than one million musical compositions, including numerous pop hits, American standards, folk songs and motion picture and theatrical compositions. Assembled over decades, its award-winning catalog includes over 70,000 songwriters and composers and a diverse range of genres including pop, rock, jazz, classical, country, R&B, hip-hop, rap, reggae, Latin, folk, blues, symphonic, soul, Broadway, techno, alternative and gospel. Warner/Chappell also administers the music and soundtracks of several third-party television and film producers and studios. The Company has an extensive production music library collectively branded as Warner/Chappell Production Music.

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Interim Financial Statements The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and six month period ended March 31, 2018 are not necessarily indicative of the results that may be expected for the fiscal year ending September 30, 2018. The consolidated balance sheet at September 30, 2017 has been derived from the audited consolidated financial statements at that date but does not include all of the information and notes required by U.S. GAAP for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017 (File No. 001-32502). Basis of Consolidation The accompanying financial statements present the consolidated accounts of all entities in which the Company has a controlling voting interest and/or variable interest required to be consolidated in accordance with U.S. GAAP. All intercompany balances and transactions have been eliminated. Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 810, Consolidation (“ASC 810”), requires the Company first evaluate its investments to determine if any investments qualify as a variable interest entity (“VIE”). A VIE is consolidated if the Company is deemed to be the primary beneficiary of the VIE, which is the party involved with the VIE that has both (i) the power to control the most significant activities of the VIE and (ii) either the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. If an entity is not deemed to be a VIE, the Company consolidates the entity if the Company has a controlling voting interest. The Company maintains a 52-53 week fiscal year ending on the last Friday in each reporting period. As such, all references to March 31, 2018 and March 31, 2017 relate to the periods ended March 30, 2018 and March 31, 2017, respectively. For convenience purposes, the Company continues to date its financial statements as of March 31. The fiscal year ended September 30, 2017 ended on September 29, 2017. The Company has performed a review of all subsequent events through the date the financial statements were issued, and has determined that no additional disclosures are necessary. Income Taxes At the end of each interim period, the Company makes its best estimate of the effective tax rate expected to be applicable for the full fiscal year and uses that rate to provide for income taxes on a current year-to-date basis before discrete items. If a reliable estimate of the annual effective tax rate cannot be made, which could be caused by the significant variability in rates when marginal earnings are expected for the year, a discrete tax rate is calculated for the period. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). In accordance with ASC Topic 740, Income Taxes (“ASC 740”) the Company recorded the impacts in the period of enactment. New Accounting Pronouncements In October 2017, the Company adopted ASU 2016-09, Compensation - Stock Compensation ("ASU 2016-09"). This ASU provides amended guidance which simplifies the accounting for share-based payment transactions involving multiple aspects of the accounting for share-based transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The adoption of ASU 2016-09 did not have any effect on the Company’s consolidated financial statements and footnote disclosures as of March 31, 2018. In May 2014, the FASB issued guidance codified in ASC 606, Revenue from Contracts with Customers (“ASC 606”), which replaces the guidance in former ASC 605, Revenue Recognition and ASC 928-605, Entertainment – Music. The amendment was the result of a joint effort by the FASB and the International Accounting Standards Board to improve financial reporting by creating common revenue recognition guidance for U.S. GAAP and international financial reporting standards ("IFRS"). The joint project clarifies the principles for recognizing revenue and develops a common revenue standard for U.S. GAAP and IFRS. ASC 606 is effective for annual periods beginning after December 15, 2017, and interim periods within those years. Early adoption is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The update may be applied using one of two methods: retrospective application to each prior reporting period presented, or retrospective application with the cumulative effect of initially applying the update recognized at the date of initial application. The Company currently plans to adopt this ASU under the modified retrospective method. While the Company is currently evaluating the impact of adoption of this new standard on the consolidated financial statements, the Company believes the most significant impact will be a change in the timing of revenue recognition in our Music Publishing segment. The Company generally records revenue from the licensing of publishing rights when cash is received. Under the new revenue recognition rules, revenues will be recorded based on best estimates available in the period of sales or usage. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). This ASU will require that equity investments are measured at fair value with changes in fair value recognized in net income. The Company may elect to measure equity investments that do not have a readily determinable fair value at cost minus impairment, if any, plus or minus changes resulting from observable price. ASU 2016-01 will be effective for annual periods beginning after December 15, 2017, and interim periods within those years. Earlier adoption is permitted. The adoption of this standard is not expected to have a significant impact on the Company’s financial statements, other than disclosure. In February 2016, the FASB issued ASU 2016-02, Leases (“ASU 2016-02”). This ASU establishes a right-of-use (“ROU”) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the statement of operations. ASU 2016-02 will be effective for annual periods beginning after December 15, 2018, and interim periods within those years. Earlier adoption is permitted. The Company is evaluating the impact of the adoption of this standard on its financial statements and disclosures. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"). This ASU provides specific guidance of how certain cash receipts and cash payments should be presented and classified in the statement of cash flows. ASU 2016-15 is effective for annual periods beginning after December 15, 2017, and interim periods within those years. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on the Company’s financial statements, other than presentation. In October 2016, the FASB issued ASU 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16"). This ASU requires the recognition of current and deferred income taxes for intra-entity asset transfers when the transaction occurs. ASU 2016-16 is effective for annual periods beginning after December 15, 2017, and interim periods within those years. Early adoption is permitted using the modified retrospective approach with a cumulative-effect to opening retained earnings in the period of adoption. The Company does not plan to early adopt this standard and the impact upon the required adoption date is not known or reasonably estimable. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). This ASU improves certain aspects of the hedge accounting model including making more risk management strategies eligible for hedge accounting and simplifying the assessment of hedge effectiveness. ASU 2017-12 is effective for all annual periods beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted and requires a prospective adoption with a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption for existing hedging relationships. The Company is evaluating the impact of the adoption of this standard on its financial statements and disclosures. In February 2018, FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (“ASU 2018-02”). This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. ASU 2018-02 is effective for all entities for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. The Company is evaluating the impact of the adoption of this standard on its financial statements and disclosures. In March 2018, the FASB issued ASU 2018-5, Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (“ASU 2018-05”). This ASU allows companies, for one year following the enactment date, to consider the impact of the Tax Act as “provisional” when a company can make a reasonable estimate but does not have the necessary information available, prepared or analyzed in reasonable detail to finalize its accounting for the impact of the Tax Act. A company may need to reflect adjustments to its provisional amounts upon obtaining, preparing or analyzing additional information about facts and circumstances that existed at the period of enactment. The Company has adopted this standard on its financial statements and disclosures. Provisional amounts are identified in Note 7 of our Consolidated Financial Statements.

Comprehensive Income (Loss)

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

Comprehensive Income (Loss)

3. Comprehensive Income (Loss)

Comprehensive income (loss), which is reported in the accompanying consolidated statements of equity, consists of net income (loss) and other gains and losses affecting equity that, under U.S. GAAP, are excluded from net income (loss). For the Company, the components of other comprehensive income (loss) primarily consist of foreign currency translation gains and losses and minimum pension liabilities. The following summary sets forth the changes in the components of accumulated other comprehensive loss, net of related taxes of less than $1 million:

	Foreign			Minimum			Deferred Income		Accumulated
	Currency			Pension			On Derivative		Other
	Translation			Liability			Financial		Comprehensive
	(Loss) Gain (a)			Adjustment			Instruments		Loss, net
	(in millions)
Balance at September 30, 2017	$	(171	)	$	(10	)	$	—	$	(181	)
Other comprehensive income		18			—			2		20
Amounts reclassified from accumulated other comprehensive income		—			—			—		—
Balance at March 31, 2018	$	(153	)	$	(10	)	$	2	$	(161	)

(a)	Includes historical foreign currency translation related to certain intra-entity transactions that are no longer considered of a long-term investment nature.

Goodwill and Intangible Assets

6 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

4. Goodwill and Intangible Assets

Goodwill

The following analysis details the changes in goodwill for each reportable segment:

	Recorded		Music
	Music		Publishing		Total
	(in millions)
Balance at September 30, 2017	$	1,221	$	464	$	1,685
Acquisitions		—		—		—
Divestitures		—		—		—
Other adjustments (a)		11		—		11
Balance at March 31, 2018	$	1,232	$	464	$	1,696

(a)	Other adjustments during the six months ended March 31, 2018 represent foreign currency movements.

The Company performs its annual goodwill impairment test in accordance with ASC 350, Intangibles—Goodwill and other (“ASC 350”) during the fourth quarter of each fiscal year as of July 1. The Company may conduct an earlier review if events or circumstances occur that would suggest the carrying value of the Company’s goodwill may not be recoverable. No indicators of impairment were identified during the current period that required the Company to perform an interim assessment or recoverability test.

At March 31, 2018 and September 30, 2017, the goodwill and intangible balances presented include the preliminary purchase accounting allocation resulting from the acquisition of Spinnin’ Records on September 7, 2017. The acquisition of Spinnin’ Records was accounted for as a business combination under ASC 805, which requires the acquisition method of accounting. At September 30, 2017, the Company performed a preliminary purchase allocation under the acquisition method of accounting, which is subject to revision based on final determinations of fair value and allocations of purchase price to the identifiable assets and liabilities acquired. At March 31, 2018, the Company has not made any significant adjustments to the preliminary allocation recorded at September 30, 2017.

Intangible Assets

Intangible assets consist of the following:

	Weighted
	Average	March 31,			September 30,
	Useful Life	2018			2017
		(in millions)
Intangible assets subject to amortization:
Recorded music catalog	10 years	$	920		$	898
Music publishing copyrights	27 years		1,564			1,534
Artist and songwriter contracts	13 years		924			904
Trademarks	6 years		14			14
Other intangible assets	7 years		17			10
Total gross intangible asset subject to amortization			3,439			3,360
Accumulated amortization			(1,402	)		(1,270	)
Total net intangible assets subject to amortization			2,037			2,090
Intangible assets not subject to amortization:
Trademarks and tradenames	Indefinite		118			117
Total net intangible assets		$	2,155		$	2,207

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Debt

6 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

5. Debt

Debt Capitalization

Long-term debt consists of the following:

	March 31,		September 30,
	2018		2017
	(in millions)
Revolving Credit Facility—Acquisition Corp. (a)	$	—	$	—
Senior Term Loan Facility due 2023—Acquisition Corp. (b)		1,307		990
5.625% Senior Secured Notes due 2022—Acquisition Corp. (c)		246		246
5.00% Senior Secured Notes due 2023—Acquisition Corp. (d)		297		297
4.125% Senior Secured Notes due 2024— Acquisition Corp. (e)		419		402
4.875% Senior Secured Notes due 2024— Acquisition Corp. (f)		247		246
6.75% Senior Notes due 2022—Acquisition Corp. (g)		111		630
5.50% Senior Notes due 2026—Acquisition Corp. (h)		320		—
Total debt (i)		2,947		2,811
Less: current portion		111		—
Total long-term debt	$	2,836	$	2,811

(a)

Reflects $180 million and $150 million of commitments under the Revolving Credit Facility at March 31, 2018 and September 30, 2017, respectively, less letters of credit outstanding of approximately $12 million at both March 31, 2018 and September 30, 2017. There were no loans outstanding under the Revolving Credit Facility at March 31, 2018 or September 30, 2017.

(b)	Principal amount of $1.326 billion and $1.006 billion less unamortized discount of $5 million and $6 million and unamortized deferred financing costs of $14 million and $10 million at March 31, 2018 and September 30, 2017, respectively.

(c)	Principal amount of $248 million less unamortized deferred financing costs of $2 million at both March 31, 2018 and September 30, 2017.

(d)	Principal amount of $300 million less unamortized deferred financing costs of $3 million at both March 31, 2018 and September 30, 2017.

(e)

Face amount of €345 million. Above amounts represent the dollar equivalent of such notes at March 31, 2018 and September 30, 2017. Principal amount of $424 million and $407 million at March 31, 2018 and September 30, 2017, respectively, less unamortized deferred financing costs of $5 million at both March 31, 2018 and September 30, 2017.

(f)	Principal amount of $250 million at both March 31, 2018 and September 30, 2017 less unamortized deferred financing costs of $3 million and $4 million at March 31, 2018 and September 30, 2017, respectively.

(g)

Principal amount of $112 million and $635 million less unamortized deferred financing costs of $1 million and $5 million at March 31, 2018 and September 30, 2017, respectively. Reflects amount not redeemed as of March 31, 2018 as described below under “Tender Offer and Notes Redemption.” The remaining 6.75% Senior Notes were redeemed on April 15, 2018.

(h)	Principal amount of $325 million less unamortized deferred financing costs of $5 million at March 31, 2018.

(i)	Principal amount of debt of $2.985 billion and $2.846 billion less unamortized discount of $5 million and $6 million and unamortized deferred financing costs of $33 million and $29 million at March 31, 2018 and September 30, 2017, respectively.

December 2017 Senior Term Loan Credit Agreement Amendment

On December 6, 2017, Acquisition Corp. entered into an amendment (the “December 2017 Senior Term Loan Credit Agreement Amendment”) to the Senior Term Loan Credit Agreement, dated November 1, 2012, among Acquisition Corp., the guarantors party thereto, the lenders party thereto and Credit Suisse AG, as administrative agent, governing Acquisition Corp.’s senior secured term loan facility with Credit Suisse AG, as administrative agent, and the other financial institutions and lenders from time to time party thereto, to, among other things, reduce the pricing terms of its outstanding term loans, change certain incurrence thresholds governing the ability to incur debt and liens, change certain EBITDA add-backs and increase the thresholds above which the excess cash flow sweep is triggered. The Company recorded a loss on extinguishment of debt of approximately $1 million, which represented the discount and unamortized deferred financing costs related to the debt of the lenders that was fully repaid.

New Revolving Credit Agreement

On January 31, 2018, the Company entered into a new revolving credit agreement (the “Revolving Credit Agreement”) for its Revolving Credit Facility, and terminated its existing revolving credit agreement (the “Old Revolving Credit Agreement”). The Revolving Credit Agreement differs from the Old Revolving Credit Agreement in that it, among other things, reduces the interest rate margin applicable to the loans, extends the maturity date thereunder, provides for the option to increase the commitments under the Company’s then existing revolving credit agreement, provides for greater flexibility to amend and extend the Company’s then existing revolving credit agreement and create additional tranches thereunder, provides for greater flexibility over future amendments, increases the springing financial maintenance covenant to 4.75:1.00 and provides that the covenant shall not be tested unless at the end of a fiscal quarter the outstanding amount of loans and drawings under letters of credit which have not been reimbursed exceeds $54 million and aligns the other negative covenants with those of the Senior Term Loan Credit Agreement. References to “Revolving Credit Facility” below in this Note 5 are to our new revolving credit facility

March 2018 Senior Term Loan Credit Agreement Amendment

On March 14, 2018, Acquisition Corp. incurred $320 million of supplemental term loans (the “Supplemental Term Loans”) pursuant to an increase supplement (the “March 2018 Senior Term Loan Credit Agreement Supplement”) to the Senior Term Loan Credit Agreement, dated November 1, 2012, among Acquisition Corp., the guarantors party thereto, the lenders party thereto and Credit Suisse AG, as administrative agent, governing Acquisition Corp.’s senior secured term loan facility with Credit Suisse AG, as administrative agent, and the other financial institutions and lenders from time to time party thereto (as amended, the “Senior Term Loan Credit Agreement”). The principal amount outstanding under the Senior Term Loan Credit Agreement including the Supplemental Term Loans is $1.326 billion.

Notes Offering

On March 14, 2018, Acquisition Corp. issued $325 million in aggregate principal amount of its 5.50% Senior Notes due 2026. Acquisition Corp. used the net proceeds to pay the consideration in the tender offer for its 6.75% Senior Notes due 2022 (the “6.75% Senior Notes”) and to redeem the remaining 6.75% Senior Notes as described below.

Tender Offer and Notes Redemption

On March 14, 2018, Acquisition Corp. accepted for purchase in connection with the tender offer for the 6.75% Senior Notes that had been validly tendered and not validly withdrawn at or prior to 5:00 p.m., New York City time on March 13, 2018 (the “Expiration Time”) thereby reducing the aggregate principal amount of the 6.75% Senior Notes by $523 million. Acquisition Corp. then issued a notice of redemption on March 14, 2018 with respect to the remaining $112 million of 6.75% Senior Notes outstanding that were not accepted for payment pursuant to the tender offer. Following payment of the 6.75% Senior Notes tendered at or prior to the Expiration Time, Acquisition Corp. deposited with the Trustee funds of $119 million to satisfy all obligations under the applicable indenture governing the 6.75% Senior Notes, including call premiums and interest through the date of redemption on April 15, 2018, for the remaining 6.75% Senior Notes not accepted for purchase in the tender offer, which is reflected as a current asset on the Company’s balance sheet at March 31, 2018. On April 15, 2018, Acquisition Corp. redeemed the remaining outstanding 6.75% Senior Notes. The Company recorded a loss on extinguishment of debt in connection with the tender offer of approximately $23 million as a result of the partial debt redemption, which represents the premium paid on early redemption and unamortized deferred financing costs. The Company expects to incur an additional loss on extinguishment of approximately $5 million in April 2018 related to the redemption on the remaining 6.75% Senior Notes, which represents the premium paid on early redemption and unamortized deferred financing costs.

Interest Rates

The loans under the Revolving Credit Facility bear interest at Acquisition Corp.’s election at a rate equal to (i) the rate for deposits in the borrowing currency in the London interbank market (adjusted for maximum reserves) for the applicable interest period (“Revolving LIBOR”) subject to a zero floor, plus 1.75% per annum, or (ii) the base rate, which is the highest of (x) the corporate base rate established by the administrative agent from time to time, (y) 0.50% in excess of the overnight federal funds rate and (z) the one-month Revolving LIBOR plus 1.0% per annum, plus, in each case, 0.75% per annum. If there is a payment default at any time, then the interest rate applicable to overdue principal will be the rate otherwise applicable to such loan plus 2.0% per annum. Default interest will also be payable on other overdue amounts at a rate of 2.0% per annum above the amount that would apply to an alternative base rate loan.

The loans under the Senior Term Loan Facility bear interest at Acquisition Corp.’s election at a rate equal to (i) the rate for deposits in U.S. dollars in the London interbank market (adjusted for maximum reserves) for the applicable interest period (“Term Loan LIBOR”) subject to a zero floor, plus 2.25% per annum, or (ii) the base rate, which is the highest of (x) the corporate base rate established by the administrative agent as its prime rate in effect at its principal office in New York City from time to time, (y) 0.50% in excess of the overnight federal funds rate and (z) one-month Term Loan LIBOR, plus 1.00% per annum, plus, in each case, 1.25% per annum. If there is a payment default at any time, then the interest rate applicable to overdue principal and interest will be the rate otherwise applicable to such loan plus 2.0% per annum. Default interest will also be payable on other overdue amounts at a rate of 2.0% per annum above the amount that would apply to an alternative base rate loan.

The Company has entered into, and in the future may enter into, interest rate swaps to manage interest rate risk.

Maturity of Senior Term Loan Facility

The loans outstanding under the Senior Term Loan Facility mature on November 1, 2023, subject, in certain circumstances, to a springing maturity inside the maturity of certain of Acquisition Corp.’s other indebtedness.

Maturity of Revolving Credit Facility

The maturity date of the Revolving Credit Facility is January 31, 2023.

Maturities of Senior Notes and Senior Secured Notes

As of March 31, 2018, there are no scheduled maturities of notes until 2022, when $360 million is scheduled to mature. Of this amount, $112 million representing the remaining principal amount of the 6.75% Senior Notes were redeemed on April 15, 2018 as described above under “Tender Offer and Notes Redemption.” Thereafter, $1.299 billion is scheduled to mature.

Interest Expense, net

Total interest expense, net, was $36 million for both the three months ended March 31, 2018 and March 31, 2017. Total interest expense, net, was $72 million and $76 million for the six months ended March 31, 2018 and March 31, 2017, respectively. The weighted-average interest rate of the Company’s total debt was 4.7% at March 31, 2018 (decreasing to 4.6% after the redemption of the remaining 6.75% Senior Notes on April 15, 2018) and 4.9% at September 30, 2017 and March 31, 2017.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	6. Commitments and Contingencies Pricing of Digital Music Downloads On December 20, 2005 and February 3, 2006, the Attorney General of the State of New York served the Company with requests for information in connection with an industry-wide investigation as to the pricing of digital music downloads. On February 28, 2006, the Antitrust Division of the U.S. Department of Justice served us with a Civil Investigative Demand, also seeking information relating to the pricing of digitally downloaded music. Both investigations were ultimately closed, but subsequent to the announcements of the investigations, more than thirty putative class action lawsuits were filed concerning the pricing of digital music downloads. The lawsuits were consolidated in the Southern District of New York. The consolidated amended complaint, filed on April 13, 2007, alleges conspiracy among record companies to delay the release of their content for digital distribution, inflate their pricing of CDs and fix prices for digital downloads. The complaint seeks unspecified compensatory, statutory and treble damages. On October 9, 2008, the District Court issued an order dismissing the case as to all defendants, including us. However, on January 13, 2010, the Second Circuit vacated the judgment of the District Court and remanded the case for further proceedings and on January 10, 2011, the U.S. Supreme Court denied the defendants’ petition for Certiorari. Upon remand to the District Court, all defendants, including the Company, filed a renewed motion to dismiss challenging, among other things, plaintiffs’ state law claims and standing to bring certain claims. The renewed motion was based mainly on arguments made in defendants’ original motion to dismiss, but not addressed by the District Court. On July 18, 2011, the District Court granted defendants’ motion in part, and denied it in part. Notably, all claims on behalf of the CD-purchaser class were dismissed with prejudice. However, a wide variety of state and federal claims remain for the class of Internet download purchasers. On March 19, 2014, plaintiffs filed a motion for class certification. Plaintiffs filed an operative consolidated amended complaint on September 25, 2015. The Company filed its answer to the fourth amended complaint on October 9, 2015, and filed an amended answer on November 3, 2015. A mediation took place on February 22, 2016, but the parties were unable to reach a resolution. On July 18, 2017, the District Court denied plaintiffs’ motion for class certification. On August 1, 2017, plaintiffs filed a petition with the Second Circuit seeking permission to appeal the district court’s order denying class certification. On August 11, 2017, defendants filed their opposition to plaintiffs’ petition. On December 8, 2017, the Second Circuit denied plaintiffs’ request for leave to appeal the District Court’s order denying their motion for class certification. The parties have reached a settlement for a nominal payment and the lawsuit will be dismissed imminently. Sirius XM On September 11, 2013, the Company joined with Capitol Records, LLC, Sony Music Entertainment, UMG Recordings, Inc. and ABKCO Music & Records, Inc. in a lawsuit brought in California Superior Court against Sirius XM Radio Inc., alleging copyright infringement for Sirius XM’s use of pre-1972 sound recordings under California law. A nation-wide settlement was reached on June 17, 2015 pursuant to which Sirius XM paid the plaintiffs, in the aggregate, $210 million on July 29, 2015 and the plaintiffs dismissed their lawsuit with prejudice. The settlement resolves all past claims as to Sirius XM’s use of pre-1972 recordings owned or controlled by the plaintiffs and enables Sirius XM, without any additional payment, to reproduce, perform and broadcast such recordings in the United States through December 31, 2017. The allocation of the settlement proceeds among the plaintiffs was determined and the settlement proceeds were distributed accordingly. This resulted in a cash distribution to the Company of $33 million of which $28 million was recognized in revenue during the 2016 fiscal year and $4 million was recognized in revenue during the 2017 fiscal year. The balance of $1 million was recognized in the first quarter of the 2018 fiscal year. The Company is sharing its allocation of the settlement proceeds with its artists on the same basis as statutory revenue from Sirius XM is shared, i.e., the artist share of our allocation will be paid to artists by SoundExchange. As part of the settlement, plaintiffs agreed to negotiate in good faith to grant Sirius XM a license to publicly perform the plaintiffs’ pre-1972 sound recordings for the five-year period running from January 1, 2018 to December 31, 2022. Pursuant to the settlement, if the parties are unable to reach an agreement on license terms, the royalty rate for each license will be determined by binding arbitration on a willing buyer/willing seller standard. On December 21, 2017, Sirius XM commenced a single arbitration against all of the plaintiffs in California through JAMS to determine the rate for the five-year period. On May 1, 2018, the Company filed a lawsuit against Sirius XM in New York state court to stay the California arbitration and to compel a separate arbitration in New York solely between Sirius XM and the Company. Other Matters In addition to the matters discussed above, the Company is involved in various litigation and regulatory proceedings arising in the normal course of business. Where it is determined, in consultation with counsel based on litigation and settlement risks, that a loss is probable and estimable in a given matter, the Company establishes an accrual. In the currently pending proceedings, the amount of accrual is not material. An estimate of the reasonably possible loss or range of loss in excess of the amounts already accrued cannot be made at this time due to various factors typical in contested proceedings, including (1) the results of ongoing discovery; (2) uncertain damage theories and demands; (3) a less than complete factual record; (4) uncertainty concerning legal theories and their resolution by courts or regulators; and (5) the unpredictable nature of the opposing party and its demands. However, the Company cannot predict with certainty the outcome of any litigation or the potential for future litigation. As such, the Company continuously monitors these proceedings as they develop and adjusts any accrual or disclosure as needed. Regardless of the outcome, litigation could have an adverse impact on the Company, including the Company’s brand value, because of defense costs, diversion of management resources and other factors and it could have a material effect on the Company’s results of operations for a given reporting period.

Income Taxes	6 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	7. Income Taxes On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (“Tax Act”). The Tax Act contains significant revisions to U.S. corporate income tax provisions, including, but not limited to, a reduction of the U.S. corporate statutory tax rate from 35% to 21%, a one-time transition tax on accumulated foreign earnings, an income inclusion of global intangible low-taxed income (“GILTI”), and a new minimum tax, base erosion anti-abuse tax (“BEAT”). In accordance with ASC 740, the Company recorded the effects of the Tax Act during the three months ended December 31, 2017, the period of enactment. The reduction in U.S. corporate statutory tax rate from 35% to 21% is effective January 1, 2018. The Tax Act requires companies with a fiscal year that begins before and ends after the effective date of the rate change to calculate a blended tax rate based on the pro rata number of days in the fiscal year before and after the effective date. As a result, for the fiscal year ending September 30, 2018, the Company’s statutory income tax rate will be 24.5%. For the fiscal year ending September 30, 2019, the Company will be subject to the U.S. corporate statutory tax rate of 21%. The reduction in the U.S. corporate statutory rate requires the Company to adjust its U.S. deferred tax assets and liabilities using the newly enacted tax rate of 21%. As a result, the Company recorded a provisional U.S. income tax expense of $26 million for the reduction of its net U.S. deferred tax assets as a discrete item for the three months ended December 31, 2017. Since the Company has a fiscal year ending September 30, 2018, and has applied an annual effective tax rate in calculating its income tax provision for the three and six months ended March 31, 2018, the impact of the U.S. corporate statutory tax rate change will not be finalized until September 30, 2018. Furthermore, the Company has a provisional deferred tax liability of approximately $4 million, after the impact of the newly enacted tax rate, associated with unremitted earnings due to the uncertainty of the treatment of future distributions under the Tax Act. The one-time transition tax on accumulated foreign earnings (“Transition Tax”) would be imposed at a rate of 15.5% for cash and equivalents and 8% for illiquid assets. The Company reasonably estimates that there is no income tax impact related to the Transition Tax and recorded no income tax liability for the three and six months ended March 31, 2018 due to an estimated overall deficit in accumulated foreign earnings. This estimate is provisional since the Company has not obtained and analyzed information necessary to finalize its accounting for the impact of the Transition Tax. The final impacts of the Transition Tax may differ from the estimate due to changes in interpretations of the Tax Act and updates or changes to the information that the Company has used to estimate the transition impact, including, but not limited to, the impacts from changes to foreign earnings estimates, foreign exchange rates, and cash positions of foreign subsidiaries. GILTI and BEAT are effective for the Company for the fiscal year ended September 30, 2019. For the period of enactment, the Company has elected not to adjust its deferred taxes for the impact of GILTI and will consider the impact of GILTI in the specific period in which it occurs. For the three and six months ended March 31, 2018, the Company recorded an income tax expense of $19 million and $71 million, respectively. The income tax expense for the three months ended March 31, 2018 is greater than expected at the blended statutory tax rate of 24.5% primarily due to foreign income taxed at rates higher than the U.S. statutory tax rate, income withholding taxes, foreign losses with no tax benefit and an increase in uncertain tax positions. The income tax expense for the six months ended March 31, 2018 is greater than the expected income tax expense at the blended statutory tax rate of 24.5% primarily due to a U.S. income tax expense of $26 million arising from a reduction in net U.S. deferred tax assets due to the change in the U.S. statutory tax rate, foreign income taxed at rates higher than the U.S. statutory tax rate, income withholding taxes, foreign losses with no tax benefit and an increase in uncertain tax positions. For the three and six months ended March 31, 2017, the Company recorded income tax expense of $3 million and $20 million, respectively. The income tax expense for the three and six months ended March 31, 2017 was lower than the expected income tax expense at the statutory tax rate of 35% primarily due to the U.S. tax benefit of a realized foreign currency loss on an intra-entity loan reduced by a related valuation allowance and further offset by income withholding taxes and foreign losses with no tax benefit. The Company has determined that it is reasonably possible that the gross unrecognized tax benefits as of March 31, 2018 could decrease by up to approximately $3 million related to various ongoing audits and settlement discussions in various foreign jurisdictions during the next twelve months.

Derivative Financial Instruments

6 Months Ended

Mar. 31, 2018

Derivative Financial Instruments

8. Derivative Financial Instruments

The Company uses derivative financial instruments, primarily foreign currency forward exchange contracts and interest rate swaps, for the purposes of managing foreign currency exchange rate risk and interest rate risk on expected future cash flows. However, the Company may choose not to hedge certain exposures for a variety of reasons including, but not limited to, accounting considerations and the prohibitive economic cost of hedging particular exposures. There can be no assurance the hedges will offset more than a portion of the financial impact resulting from movements in foreign currency exchange or interest rates.

The Company enters into foreign currency forward exchange contracts primarily to hedge the risk that unremitted or future royalties and license fees owed to its domestic companies for the sale, or anticipated sale, of U.S.-copyrighted products abroad may be adversely affected by changes in foreign currency exchange rates. The Company focuses on managing the level of exposure to the risk of foreign currency exchange rate fluctuations on its major currencies, which include the Euro, British pound sterling, Japanese yen, Canadian dollar, Swedish krona and Australian dollar. The foreign currency forward exchange contracts related to royalties are designated and qualify as cash flow hedges under the criteria prescribed in ASC 815, Derivatives and Hedging. The Company records these contracts at fair value on its balance sheet and gains or losses on these contracts are deferred in equity (as a component of comprehensive loss). These deferred gains and losses are recognized in income in the period in which the related royalties and license fees being hedged are received and recognized in income. However, to the extent that any of these contracts are not considered to be perfectly effective in offsetting the change in the value of the royalties and license fees being hedged, any changes in fair value relating to the ineffective portion of these contracts are immediately recognized in the statement of operations.

The Company may at times choose to hedge foreign currency risk associated with financing transactions such as third-party debt and other balance sheet items. The foreign currency forward exchange contracts related to balance sheet items denominated in foreign currency are reviewed on a contract-by-contract basis and are designated accordingly. If these foreign currency forward exchange contracts do not qualify for hedge accounting, then the Company records these contracts at fair value on its balance sheet and the related gains and losses are immediately recognized in the statement of operations where there is an equal and offsetting entry related to the underlying exposure.

The Company has entered into, and in the future may enter into, interest rate swaps to manage interest rate risk. These instruments may offset a portion of changes in income or expense, or changes in fair value of the Company’s term debt. The interest rate swap instruments are designated and qualify as cash flow hedges under the criteria prescribed in ASC 815, Derivatives and Hedging. The Company records these contracts at fair value on its balance sheet and gains or losses on these contracts are deferred in equity (as a component of comprehensive loss).

The fair value of foreign currency forward exchange contracts is determined by using observable market transactions of spot and forward rates (i.e., Level 2 inputs) which is discussed further in Note 11. Additionally, netting provisions are provided for in existing International Swap and Derivative Association Inc. agreements in situations where the Company executes multiple contracts with the same counterparty. As a result, net assets or liabilities resulting from foreign exchange derivatives subject to these netting agreements are classified within other current assets or other current liabilities in the Company’s consolidated balance sheets.

The Company’s hedged interest rate transactions as of March 31, 2018 are expected to be recognized within 5 years. The fair value of interest rate swaps is based on dealer quotes of market rates (i.e., Level 2 inputs) which is discussed further in Note 11. Interest income or expense related to interest rate swaps is recognized in interest income, net in the same period as the related expense is recognized. The ineffective portions of interest rate swaps is recognized in other income/(expense), net in the period measured.

The Company monitors its positions with, and the credit quality of, the financial institutions that are party to any of its financial transactions.

As of March 31, 2018, the Company had outstanding hedge contracts for the sale of $197 million and the purchase of $114 million of foreign currencies at fixed rates that will be settled by September 2018. As of March 31, 2018, the Company had $2 million of unrealized deferred income in comprehensive income related to foreign exchange hedging. As of September 30, 2017, the Company had no outstanding hedge contracts and no deferred gains or losses in comprehensive loss related to foreign exchange hedging.

As of March 31, 2018, the Company had outstanding $320 million in pay-fixed receive-variable interest rate swaps with $1 million of unrealized deferred losses in comprehensive income related to the interest rate swap. As of September 30, 2017, the Company had no outstanding interest rate swaps and no deferred gains or losses in comprehensive income or losses related to interest rate swaps.

The pre-tax gains and losses of the Company’s derivative interest rate swaps designated as cash flow hedges recorded in OCI and the Consolidated Statement of Comprehensive Income at March 31, 2018 and September 30, 2017 were $1 million and nil, respectively.

The following is a summary of amounts recorded in the Consolidated Balance Sheet pertaining to the Company’s designated cash flows hedges at March 31, 2018 and September 30, 2017:

	March 31,		September 30,
	2018 (a)		2017
	(in millions)
Other current assets	$	2	$	—
Other current liabilities		3		—
Other noncurrent assets		—		—
Other noncurrent liabilities		1		—

(a)	$5 million and $6 million of foreign exchange derivative contracts in asset and liability positions, respectively, and $1 million of interest rate swap in a liability position including non-designated cash flow hedges.

Segment Information

6 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

9. Segment Information

As discussed more fully in Note 1, based on the nature of its products and services, the Company classifies its business interests into two fundamental operations: Recorded Music and Music Publishing, which also represent reportable segments of the Company. Information as to each of these operations is set forth below. The Company evaluates performance based on several factors, of which the primary financial measure is operating income (loss) before non-cash depreciation of tangible assets and non-cash amortization of intangible assets (“OIBDA”). The Company has supplemented its analysis of OIBDA results by segment with an analysis of operating income (loss) by segment.

The accounting policies of the Company’s business segments are the same as those described in the summary of significant accounting policies included elsewhere herein. The Company accounts for intersegment sales at fair value as if the sales were to third parties. While intercompany transactions are treated like third-party transactions to determine segment performance, the revenues (and corresponding expenses recognized by the segment that is counterparty to the transaction) are eliminated in consolidation, and therefore, do not themselves impact consolidated results.

					Corporate
	Recorded		Music		expenses and
	Music		Publishing		eliminations			Total
Three Months Ended	(in millions)
March 31, 2018
Revenues	$	791	$	174	$	(2	)	$	963
Operating income (loss)		80		41		(38	)		83
Amortization of intangible assets		38		17		—			55
Depreciation of property, plant and equipment		9		2		3			14
OIBDA		127		60		(35	)		152
March 31, 2017
Revenues	$	686	$	145	$	(6	)	$	825
Operating income (loss)		69		41		(32	)		78
Amortization of intangible assets		34		16		—			50
Depreciation of property, plant and equipment		9		1		3			13
OIBDA		112		58		(29	)		141

					Corporate
	Recorded		Music		expenses and
	Music		Publishing		eliminations			Total
Six Months Ended	(in millions)
March 31, 2018
Revenues	$	1,695	$	317	$	(4	)	$	2,008
Operating income (loss)		209		40		(76	)		173
Amortization of intangible assets		74		34		—			108
Depreciation of property, plant and equipment		17		3		6			26
OIBDA		300		77		(70	)		307
March 31, 2017
Revenues	$	1,483	$	269	$	(10	)	$	1,742
Operating income (loss)		192		39		(59	)		172
Amortization of intangible assets		69		32		—			101
Depreciation of property, plant and equipment		16		3		6			25
OIBDA		277		74		(53	)		298

Additional Financial Information	6 Months Ended
Additional Financial Information	Mar. 31, 2018
Additional Financial Information [Abstract]
Additional Financial Information	10. Additional Financial Information Cash Interest and Taxes The Company made interest payments of approximately $34 million and $17 million during the three months ended March 31, 2018 and March 31, 2017, respectively. The Company made interest payments of approximately $86 million and $64 million during the six months ended March 31, 2018 and March 31, 2017, respectively. The Company paid approximately $10 million of income and withholding taxes, partially offset by $1 million of refunds, during the three months ended March 31, 2018 and paid approximately $13 million of income and withholding taxes, partially offset by $3 million of refunds during the three months ended March 31, 2017. The Company paid approximately $18 million of income and withholding taxes, partially offset by $1 million of refunds, during the six months ended March 31, 2018 and paid approximately $22 million of income and withholding taxes, partially offset by $3 million of refunds during the six months ended March 31, 2017.

Fair Value Measurements

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

11. Fair Value Measurements

ASC 820, Fair Value Measurement, defines fair value as the price that would be received upon sale of an asset or paid upon transfer of a liability in an orderly transaction between market participants at the measurement date and in the principal or most advantageous market for that asset or liability. The fair value should be calculated based on assumptions that market participants would use in pricing the asset or liability, not on assumptions specific to the entity.

In addition to defining fair value, ASC 820 expands the disclosure requirements around fair value and establishes a fair value hierarchy for valuation inputs. The hierarchy prioritizes the inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of the three levels which is determined by the lowest level input that is significant to the fair value measurement in its entirety. These levels are:

•

Level 1—inputs are based upon unadjusted quoted prices for identical instruments traded in active markets.

•

Level 2—inputs are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

•

Level 3—inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models and similar techniques.

In accordance with the fair value hierarchy, described above, the following table shows the fair value of the Company’s financial instruments that are required to be measured at fair value as of March 31, 2018 and September 30, 2017.

	Fair Value Measurements as of March 31, 2018
	(Level 1)		(Level 2)			(Level 3)			Total
	(in millions)
Other Current Assets:
Foreign Currency Forward Exchange Contracts (a)	$	—	$	2		$	—		$	2
Other Current Liabilities:
Foreign Currency Forward Exchange Contracts (a)		—		(3	)		—			(3	)
Other Current Liabilities:
Contractual Obligations (b)		—		—			—			—
Other Non-Current Liabilities:
Contractual Obligations (b)		—		—			(6	)		(6	)
Interest Rate Swap (c)		—		(1	)		—			(1	)
Total	$	—	$	(2	)	$	(6	)	$	(8	)

	Fair Value Measurements as of September 30, 2017
	(Level 1)		(Level 2)		(Level 3)			Total
	(in millions)
Other Current Liabilities:
Contractual Obligations (b)		—		—		—			—
Other Non-Current Liabilities:
Contractual Obligations (b)		—		—		(5	)		(5	)
Total	$	—	$	—	$	(5	)	$	(5	)

(a)	The fair value of foreign currency forward exchange contracts is based on dealer quotes of market forward rates and reflects the amount that the Company would receive or pay at their maturity dates for contracts involving the same currencies and maturity dates.

(b)

This represents purchase obligations and contingent consideration related to the Company’s various acquisitions. This is based on a discounted cash flow approach and it is adjusted to fair value on a recurring basis and any adjustments are included as a component of operating income in the statement of operations. These amounts were mainly calculated using unobservable inputs such as future earnings performance of the Company’s various acquisitions and the expected timing of the payment.

(c)	The fair value of the interest rate swap is based on dealer quotes of market forward rates and reflects the amount that the Company would receive or pay as of March 31, 2018 for contracts involving the same attributes and maturity dates.

The following table reconciles the beginning and ending balances of net assets and liabilities classified as Level 3:

	Total
	(in millions)
Balance at September 30, 2017		(5	)
Additions		(1	)
Reductions		—
Payments		—
Balance at March 31, 2018	$	(6	)

The majority of the Company’s non-financial instruments, which include goodwill, intangible assets, inventories, and property, plant, and equipment, are not required to be re-measured to fair value on a recurring basis. These assets are evaluated for impairment if certain triggering events occur. If such evaluation indicates that impairment exists, the asset is written down to its fair value. In addition, an impairment analysis is performed at least annually for goodwill and indefinite-lived intangible assets.

Fair Value of Debt

Based on the level of interest rates prevailing at March 31, 2018, the fair value of the Company’s debt was $3.027 billion. Based on the level of interest rates prevailing at September 30, 2017, the fair value of the Company’s debt was $2.936 billion. The fair value of the Company’s debt instruments are determined using quoted market prices from less active markets or by using quoted market prices for instruments with identical terms and maturities; both approaches are considered a Level 2 measurement.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Subsequent Events	6 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Events Spotify Share Sale Subsequent to March 31, 2018, the Company sold shares of common stock received as consideration under contracts entered into in the ordinary course of business with Spotify Technology S.A. for aggregate consideration of approximately $400 million in cash proceeds, a portion of such proceeds which the Company expects to share with artists. The sale of shares will result in a pre-tax gain, net, of approximately $300 million. Any unrealized gains or losses on the remaining shares held by the Company will be recorded to other income (expense). Special Cash Dividend On May 7, 2018, our Board of Directors declared a special cash dividend of $300 million to be paid on May 11, 2018 to stockholders of record as of May 7, 2018.

Guarantor and Non-Guarantor Subsidiaries Financial Information

6 Months Ended

Mar. 31, 2018

Guarantor and Non-Guarantor Subsidiaries Financial Information

WARNER MUSIC GROUP CORP.

Supplementary Information

Consolidating Financial Statements

The Company is the direct parent of Holdings, which is the direct parent of Acquisition Corp. Acquisition Corp. has issued and outstanding the 5.625% Senior Secured Notes due 2022, the 5.00% Senior Secured Notes due 2023, the 4.125% Senior Secured Notes due 2024, the 4.875% Senior Secured Notes due 2024, the 6.75% Senior Notes due 2022 and the 5.50% Senior Notes due 2026 (together, the “Acquisition Corp. Notes”).

The Acquisition Corp. Notes are guaranteed by the Company and, in addition, are guaranteed by all of Acquisition Corp.’s domestic wholly-owned subsidiaries. The secured notes are guaranteed on a senior secured basis and the unsecured notes are guaranteed on an unsecured senior basis. The Company’s guarantee of the Acquisition Corp. Notes is full and unconditional. The guarantee of the Acquisition Corp. Notes by Acquisition Corp.’s domestic, wholly-owned subsidiaries are full, unconditional and joint and several. The following condensed consolidating financial statements are also presented for the information of the holders of the Acquisition Corp. Notes and present the results of operations, financial position and cash flows of (i) Acquisition Corp., which is the issuer of the Acquisition Corp. Notes, (ii) the guarantor subsidiaries of Acquisition Corp., (iii) the non-guarantor subsidiaries of Acquisition Corp. and (iv) the eliminations necessary to arrive at the information for Acquisition Corp. on a consolidated basis. Investments in consolidated subsidiaries are presented under the equity method of accounting. There are no restrictions on Acquisition Corp.’s ability to obtain funds from any of its wholly-owned subsidiaries through dividends, loans or advances.

The Company and Holdings are holding companies that conduct substantially all of their business operations through Acquisition Corp. Accordingly, the ability of the Company and Holdings to obtain funds from their subsidiaries is restricted by the indentures for the Acquisition Corp. Notes and the credit agreements for the Acquisition Corp. Senior Credit Facilities, including the Revolving Credit Facility and Senior Term Loan Facility.

Consolidating Balance Sheet (Unaudited)

March 31, 2018

	WMG											WMG				Warner					Warner
	Acquisition					Non-						Acquisition		WMG		Music					Music
	Corp.		Guarantor			Guarantor						Corp.		Holdings		Group					Group Corp.
	(issuer)		Subsidiaries			Subsidiaries			Eliminations			Consolidated		Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Assets:
Current assets:
Cash and equivalents	$	—	$	329		$	283		$	—		$	612	$	—	$	—	$	—		$	612
Redemption deposit		119		—			—			—			119		—		—		—			119
Accounts receivable, net		—		230			197			—			427		—		—		—			427
Inventories		—		14			25			—			39		—		—		—			39
Royalty advances expected to be recouped within one year		—		98			50			—			148		—		—		—			148
Prepaid and other current assets		—		12			50			—			62		—		—		—			62
Total current assets		119		683			605			—			1,407		—		—		—			1,407
Due (to) from parent companies		518		(49	)		(469	)		—			—		—		—		—			—
Investments in and advances to consolidated subsidiaries		2,520		1,630			—			(4,150	)		—		398		398		(796	)		—
Royalty advances expected to be recouped after one year		—		120			61			—			181		—		—		—			181
Property, plant and equipment, net		—		138			76			—			214		—		—		—			214
Goodwill		—		1,368			328			—			1,696		—		—		—			1,696
Intangible assets subject to amortization, net		—		992			1,045			—			2,037		—		—		—			2,037
Intangible assets not subject to amortization		—		71			47			—			118		—		—		—			118
Deferred tax assets, net		—		44			8			—			52		—		—		—			52
Other assets		8		50			19			—			77		—		—		—			77
Total assets	$	3,165	$	5,047		$	1,720		$	(4,150	)	$	5,782	$	398	$	398	$	(796	)	$	5,782
Liabilities and Deficit:
Current liabilities:
Accounts payable	$	1	$	126		$	76		$	—		$	203	$	—	$	—	$	—		$	203
Accrued royalties		—		785			573			—			1,358		—		—		—			1,358
Accrued liabilities		—		155			185			—			340		—		—		—			340
Accrued interest		27		—			—			—			27		—		—		—			27
Deferred revenue		—		146			51			—			197		—		—		—			197
Current portion of long-term debt		111		—			—			—			111		—		—		—			111
Other current liabilities		—		5			32			—			37		—		—		—			37
Total current liabilities		139		1,217			917			—			2,273		—		—		—			2,273
Long-term debt		2,836		—			—			—			2,836		—		—		—			2,836
Deferred tax liabilities, net		—		—			194			—			194		—		—		—			194
Other noncurrent liabilities		1		156			117			—			274		—		—		—			274
Total liabilities		2,976		1,373			1,228			—			5,577		—		—		—			5,577
Total Warner Music Group Corp. equity		189		3,669			481			(4,150	)		189		398		398		(796	)		189
Noncontrolling interest		—		5			11			—			16		—		—		—			16
Total equity		189		3,674			492			(4,150	)		205		398		398		(796	)		205
Total liabilities and equity	$	3,165	$	5,047		$	1,720		$	(4,150	)	$	5,782	$	398	$	398	$	(796	)	$	5,782

Consolidating Balance Sheet

September 30, 2017

	WMG										WMG				Warner					Warner
	Acquisition				Non-						Acquisition		WMG		Music					Music
	Corp.		Guarantor		Guarantor						Corp.		Holdings		Group					Group Corp.
	(issuer)		Subsidiaries		Subsidiaries			Eliminations			Consolidated		Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Assets:
Current assets:
Cash and equivalents	$	—	$	347	$	300		$	—		$	647	$	—	$	—	$	—		$	647
Accounts receivable, net		—		214		190			—			404		—		—		—			404
Inventories		—		12		27			—			39		—		—		—			39
Royalty advances expected to be recouped within one year		—		89		52			—			141		—		—		—			141
Prepaid and other current assets		—		15		29			—			44		—		—		—			44
Total current assets		—		677		598			—			1,275		—		—		—			1,275
Due from (to) parent companies		418		96		(514	)		—			—		—		—		—			—
Investments in and advances to consolidated subsidiaries		2,721		1,312		—			(4,033	)		—		377		377		(754	)		—
Royalty advances expected to be recouped after one year		—		109		63			—			172		—		—		—			172
Property, plant and equipment, net		—		139		74			—			213		—		—		—			213
Goodwill		—		1,368		317			—			1,685		—		—		—			1,685
Intangible assets subject to amortization, net		—		1,029		1,061			—			2,090		—		—		—			2,090
Intangible assets not subject to amortization		—		71		46			—			117		—		—		—			117
Deferred tax assets, net		—		89		8			—			97		—		—		—			97
Other assets		7		45		17			—			69		—		—		—			69
Total assets	$	3,146	$	4,935	$	1,670		$	(4,033	)	$	5,718	$	377	$	377	$	(754	)	$	5,718
Liabilities and Deficit:
Current liabilities:
Accounts payable	$	—	$	135	$	73		$	—		$	208	$	—	$	—	$	—		$	208
Accrued royalties		—		732		531			—			1,263		—		—		—			1,263
Accrued liabilities		—		144		221			—			365		—		—		—			365
Accrued interest		41		—		—			—			41		—		—		—			41
Deferred revenue		—		125		72			—			197		—		—		—			197
Other current liabilities		—		3		23			—			26		—		—		—			26
Total current liabilities		41		1,139		920			—			2,100		—		—		—			2,100
Long-term debt		2,811		—		—			—			2,811		—		—		—			2,811
Deferred tax liabilities, net		—		—		190			—			190		—		—		—			190
Other noncurrent liabilities		1		196		112			—			309		—		—		—			309
Total liabilities		2,853		1,335		1,222			—			5,410		—		—		—			5,410
Total Warner Music Group Corp. equity		293		3,596		437			(4,033	)		293		377		377		(754	)		293
Noncontrolling interest		—		4		11			—			15		—		—		—			15
Total equity		293		3,600		448			(4,033	)		308		377		377		(754	)		308
Total liabilities and equity	$	3,146	$	4,935	$	1,670		$	(4,033	)	$	5,718	$	377	$	377	$	(754	)	$	5,718

Consolidating Statement of Operations (Unaudited)

For The Three Months Ended March 31, 2018

	WMG												WMG						Warner					Warner
	Acquisition						Non-						Acquisition			WMG			Music					Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group					Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations		Consolidated
	(in millions)
Revenues	$	—		$	535		$	549		$	(121	)	$	963		$	—		$	—		$	—	$	963
Costs and expenses:
Cost of revenue		—			(242	)		(327	)		81			(488	)		—			—			—		(488	)
Selling, general and administrative expenses		—			(244	)		(135	)		42			(337	)		—			—			—		(337	)
Amortization of intangible assets		—			(23	)		(32	)		—			(55	)		—			—			—		(55	)
Total costs and expenses		—			(509	)		(494	)		123			(880	)		—			—			—		(880	)
Operating income		—			26			55			2			83			—			—			—		83
Loss on extinguishment of debt		(23	)		—			—			—			(23	)		—			—			—		(23	)
Interest expense, net		(31	)		—			(5	)		—			(36	)		—			—			—		(36	)
Equity gains (losses) from equity method investments		66			33			—			(99	)		—			(3	)		(3	)		6		—
Other expense, net		4			(1	)		(9	)		—			(6	)		—			—			—		(6	)
Income (loss) before income taxes		16			58			41			(97	)		18			(3	)		(3	)		6		18
Income tax (expense) benefit		(19	)		(18	)		(18	)		36			(19	)		—			—			—		(19	)
Net (loss) income		(3	)		40			23			(61	)		(1	)		(3	)		(3	)		6		(1	)
Less: income attributable to noncontrolling interest		—			(1	)		(1	)		—			(2	)		—			—			—		(2	)
Net (loss) income attributable to Warner Music Group Corp.	$	(3	)	$	39		$	22		$	(61	)	$	(3	)	$	(3	)	$	(3	)	$	6	$	(3	)

Consolidating Statement of Operations (Unaudited)

For The Three Months Ended March 31, 2017

	WMG												WMG					Warner					Warner
	Acquisition						Non-						Acquisition			WMG		Music					Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Revenues	$	—		$	470		$	439		$	(84	)	$	825		$	—	$	—	$	—		$	825
Costs and expenses:
Cost of revenue		—			(204	)		(268	)		57			(415	)		—		—		—			(415	)
Selling, general and administrative expenses		—			(199	)		(110	)		27			(282	)		—		—		—			(282	)
Amortization of intangible assets		—			(26	)		(24	)		—			(50	)		—		—		—			(50	)
Total costs and expenses		—			(429	)		(402	)		84			(747	)		—		—		—			(747	)
Operating income		—			41			37			—			78			—		—		—			78
Interest (expense) income, net		(21	)		1			(16	)		—			(36	)		—		—		—			(36	)
Equity gains (losses) from equity method investments		49			11			—			(60	)		—			19		19		(38	)		—
Other expense, net		(6	)		—			(13	)		—			(19	)		—		—		—			(19	)
Income before income taxes		22			53			8			(60	)		23			19		19		(38	)		23
Income tax (expense) benefit		(3	)		(4	)		(7	)		11			(3	)		—		—		—			(3	)
Net income		19			49			1			(49	)		20			19		19		(38	)		20
Less: income attributable to noncontrolling interest		—			—			(1	)		—			(1	)		—		—		—			(1	)
Net income attributable to Warner Music Group Corp.	$	19		$	49		$	—		$	(49	)	$	19		$	19	$	19	$	(38	)	$	19

Consolidating Statement of Operations (Unaudited)

For The Six Months Ended March 31, 2018

	WMG												WMG					Warner					Warner
	Acquisition						Non-						Acquisition			WMG		Music					Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Revenues	$	—		$	1,082		$	1,170		$	(244	)	$	2,008		$	—	$	—	$	—		$	2,008
Costs and expenses:
Cost of revenue		—			(499	)		(720	)		162			(1,057	)		—		—		—			(1,057	)
Selling, general and administrative expenses		—			(479	)		(273	)		82			(670	)		—		—		—			(670	)
Amortization of intangible assets		—			(47	)		(61	)		—			(108	)		—		—		—			(108	)
Total costs and expenses		—			(1,025	)		(1,054	)		244			(1,835	)		—		—		—			(1,835	)
Operating income		—			57			116			—			173			—		—		—			173
Loss on extinguishment of debt		(24	)		—			—			—			(24	)		—		—		—			(24	)
Interest (expense) income, net		(60	)		1			(13	)		—			(72	)		—		—		—			(72	)
Equity gains (losses) from equity method investments		156			76			—			(232	)		—			1		1		(2	)		—
Other expense, net		—			9			(11	)		—			(2	)		—		—		—			(2	)
Income before income taxes		72			143			92			(232	)		75			1		1		(2	)		75
Income tax (expense) benefit		(71	)		(69	)		(28	)		97			(71	)		—		—		—			(71	)
Net income (loss)		1			74			64			(135	)		4			1		1		(2	)		4
Less: income attributable to noncontrolling interest		—			(1	)		(2	)		—			(3	)		—		—		—			(3	)
Net income attributable to Warner Music Group Corp.	$	1		$	73		$	62		$	(135	)	$	1		$	1	$	1	$	(2	)	$	1

Consolidating Statement of Operations (Unaudited)

For The Six Months Ended March 31, 2017

	WMG												WMG					Warner					Warner
	Acquisition						Non-						Acquisition			WMG		Music					Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Revenues	$	—		$	960		$	960		$	(178	)	$	1,742		$	—	$	—	$	—		$	1,742
Costs and expenses:
Cost of revenue		—			(424	)		(609	)		122			(911	)		—		—		—			(911	)
Selling, general and administrative expenses		(1	)		(375	)		(238	)		56			(558	)		—		—		—			(558	)
Amortization of intangible assets		—			(51	)		(50	)		—			(101	)		—		—		—			(101	)
Total costs and expenses		(1	)		(850	)		(897	)		178			(1,570	)		—		—		—			(1,570	)
Operating (loss) income		(1	)		110			63			—			172			—		—		—			172
Loss on extinguishment of debt		(32	)		—			—			—			(32	)		—		—		—			(32	)
Interest (expense) income, net		(44	)		2			(34	)		—			(76	)		—		—		—			(76	)
Equity gains (losses) from equity method investments		132			51			—			(183	)		—			41		41		(82	)		—
Other income (expense), net		6			3			(9	)		—			—			—		—		—			—
Income before income taxes		61			166			20			(183	)		64			41		41		(82	)		64
Income tax (expense) benefit		(20	)		(22	)		(16	)		38			(20	)		—		—		—			(20	)
Net income		41			144			4			(145	)		44			41		41		(82	)		44
Less: income attributable to noncontrolling interest		—			—			(3	)		—			(3	)		—		—		—			(3	)
Net income attributable to Warner Music Group Corp.	$	41		$	144		$	1		$	(145	)	$	41		$	41	$	41	$	(82	)	$	41

Consolidating Statement of Comprehensive Income (Unaudited)

For The Three Months Ended March 31, 2018

	WMG												WMG						Warner						Warner
	Acquisition						Non-						Acquisition			WMG			Music						Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group						Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations			Consolidated
	(in millions)
Net (loss) income	$	(3	)	$	40		$	23		$	(61	)	$	(1	)	$	(3	)	$	(3	)	$	6		$	(1	)
Other comprehensive income (loss), net of tax:
Foreign currency adjustment		9			—			(9	)		9			9			9			9			(18	)		9
Deferred gains on derivative financial instruments		1			—			1			(1	)		1			1			1			(2	)		1
Other comprehensive income (loss), net of tax:		10			—			(8	)		8			10			10			10			(20	)		10
Total comprehensive income		7			40			15			(53	)		9			7			7			(14	)		9
Less: income attributable to noncontrolling interest		—			(1	)		(1	)		—			(2	)		—			—			—			(2	)
Comprehensive income attributable to Warner Music Group Corp.	$	7		$	39		$	14		$	(53	)	$	7		$	7		$	7		$	(14	)	$	7

Consolidating Statement of Comprehensive Income (Unaudited)

For The Three Months Ended March 31, 2017

	WMG										WMG					Warner					Warner
	Acquisition				Non-						Acquisition			WMG		Music					Music
	Corp.		Guarantor		Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)		Subsidiaries		Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Net income	$	19	$	49	$	1		$	(49	)	$	20		$	19	$	19	$	(38	)	$	20
Other comprehensive income, net of tax:
Foreign currency adjustment		24		—		(50	)		50			24			24		24		(48	)		24
Deferred gains on derivative financial instruments		1		1		—			(1	)		1			1		1		(2	)		1
Other comprehensive income, net of tax:		25		1		(50	)		49			25			25		25		(50	)		25
Total comprehensive income		44		50		(49	)		—			45			44		44		(88	)		45
Less: income attributable to noncontrolling interest		—		—		(1	)		—			(1	)		—		—		—			(1	)
Comprehensive income (loss) attributable to Warner Music Group Corp.	$	44	$	50	$	(50	)	$	—		$	44		$	44	$	44	$	(88	)	$	44

Consolidating Statement of Comprehensive Income (Unaudited)

For The Six Months Ended March 31, 2018

	WMG											WMG					Warner					Warner
	Acquisition					Non-						Acquisition			WMG		Music					Music
	Corp.		Guarantor			Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)		Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Net income (loss)	$	1	$	74		$	64		$	(135	)	$	4		$	1	$	1	$	(2	)	$	4
Other comprehensive income (loss), net of tax:
Foreign currency adjustment		18		—			(18	)		18			18			18		18		(36	)		18
Deferred losses on derivative financial instruments		2		—			—			—			2			2		2		(4	)		2
Other comprehensive income (loss), net of tax:		20		—			(18	)		18			20			20		20		(40	)		20
Total comprehensive income (loss)		21		74			46			(117	)		24			21		21		(42	)		24
Less: income attributable to noncontrolling interest		—		(1	)		(2	)		—			(3	)		—		—		—			(3	)
Comprehensive income attributable to Warner Music Group Corp.	$	21	$	73		$	44		$	(117	)	$	21		$	21	$	21	$	(42	)	$	21

Consolidating Statement of Comprehensive Income (Unaudited)

For The Six Months Ended March 31, 2017

	WMG												WMG						Warner						Warner
	Acquisition						Non-						Acquisition			WMG			Music						Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group						Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations			Consolidated
	(in millions)
Net income	$	41		$	144		$	4		$	(145	)	$	44		$	41		$	41		$	(82	)	$	44
Other comprehensive (loss) income, net of tax:
Foreign currency adjustment		(13	)		—			(13	)		13			(13	)		(13	)		(13	)		26			(13	)
Deferred losses on derivative financial instruments		(1	)		(1	)		—			1			(1	)		(1	)		(1	)		2			(1	)
Other comprehensive (loss) income, net of tax:		(14	)		(1	)		(13	)		14			(14	)		(14	)		(14	)		28			(14	)
Total comprehensive income (loss)		27			143			(9	)		(131	)		30			27			27			(54	)		30
Less: income attributable to noncontrolling interest		—			—			(3	)		—			(3	)		—			—			—			(3	)
Comprehensive income (loss) attributable to Warner Music Group Corp.	$	27		$	143		$	(12	)	$	(131	)	$	27		$	27		$	27		$	(54	)	$	27

Consolidating Statement of Cash Flows (Unaudited)

For The Six Months Ended March 31, 2018

	WMG												WMG						Warner						Warner
	Acquisition						Non-						Acquisition			WMG			Music						Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group						Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations			Consolidated
	(in millions)
Cash flows from operating activities
Net income (loss)	$	1		$	74		$	64		$	(135	)	$	4		$	1		$	1		$	(2	)	$	4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		—			67			67			—			134			—			—			—			134
Unrealized losses and remeasurement of foreign denominated loans		17			3			(9	)		—			11			—			—			—			11
Deferred income taxes		—			—			38			—			38			—			—			—			38
Loss on extinguishment of debt		24			—			—			—			24			—			—			—			24
Net (gain) loss on divestitures and investments		—			(7	)		—			—			(7	)		—			—			—			(7	)
Non-cash interest expense		3			—			—			—			3			—			—			—			3
Equity-based compensation expense		—			27			—			—			27			—			—			—			27
Equity (gains) losses, including distributions		(156	)		(76	)		—			232			—			(1	)		(1	)		2			—
Changes in operating assets and liabilities:
Accounts receivable		—			(16	)		1			—			(15	)		—			—			—			(15	)
Inventories		—			(1	)		2			—			1			—			—			—			1
Royalty advances		—			(20	)		8			—			(12	)		—			—			—			(12	)
Accounts payable and accrued liabilities		—			101			(104	)		(97	)		(100	)		—			—			—			(100	)
Royalty payables		—			48			20			—			68			—			—			—			68
Accrued interest		(14	)		—			—			—			(14	)		—			—			—			(14	)
Deferred revenue		—			9			(25	)		—			(16	)		—			—			—			(16	)
Other balance sheet changes		(4	)		43			(49	)		—			(10	)		—			—			—			(10	)
Net cash provided (used in) by operating activities		(129	)		252			13			—			136			—			—			—			136
Cash flows from investing activities
Acquisition of music publishing rights, net		—			(4	)		(1	)		—			(5	)		—			—			—			(5	)
Capital expenditures		—			(23	)		(6	)		—			(29	)		—			—			—			(29	)
Investments and acquisitions of businesses, net		—			(6	)		—			—			(6	)		—			—			—			(6	)
Proceeds from the sale of investments		—			12			—			—			12			—			—			—			12
Advances from issuer		151			—			—			(151	)		—			—			—			—			—
Net cash (used in) provided by investing activities		151			(21	)		(7	)		(151	)		(28	)		—			—			—			(28	)
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp. 5.50% Senior Notes		325			—			—			—			325			—			—			—			325
Proceeds from supplement of Acquisition Corp. Senior Term Loan Facility		320			—			—			—			320			—			—			—			320
Repayment of and redemption deposit for Acquisition Corp. 6.75% Senior Notes		(635	)		—			—			—			(635	)		—			—			—			(635	)
Call premiums paid on and redemption deposit for early redemption of debt		(23	)		—			—			—			(23	)		—			—			—			(23	)
Deferred financing costs paid		(9	)		—			—			—			(9	)		—			—			—			(9	)
Distribution to noncontrolling interest holder		—			—			(2	)		—			(2	)		—			—			—			(2	)
Dividends paid		—			(98	)		(27	)		—			(125	)		—			—			—			(125	)
Change in due to (from) issuer		—			(151	)		—			151			—			—			—			—			—
Net cash (used in) provided by financing activities		(22	)		(249	)		(29	)		151			(149	)		—			—			—			(149	)
Effect of exchange rate changes on cash and equivalents		—			—			6			—			6			—			—			—			6
Net decrease in cash and equivalents		—			(18	)		(17	)		—			(35	)		—			—			—			(35	)
Cash and equivalents at beginning of period		—			347			300			—			647			—			—			—			647
Cash and equivalents at end of period	$	—		$	329		$	283		$	—		$	612		$	—		$	—		$	—		$	612

Consolidating Statement of Cash Flows (Unaudited)

For The Six Months Ended March 31, 2017

	WMG												WMG						Warner						Warner
	Acquisition						Non-						Acquisition			WMG			Music						Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group						Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations			Consolidated
	(in millions)
Cash flows from operating activities
Net income	$	41		$	144		$	4		$	(145	)	$	44		$	41		$	41		$	(82	)	$	44
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		—			70			56			—			126			—			—			—			126
Unrealized (gains)/losses and remeasurement of foreign denominated loans		(11	)		(3	)		13			—			(1	)		—			—			—			(1	)
Deferred income taxes		2			2			(12	)		(4	)		(12	)		—			—			—			(12	)
Loss on extinguishment of debt		32			—			—			—			32			—			—			—			32
Net loss on divestiture and investments		—			5			1			—			6			—			—			—			6
Non-cash interest expense		5			—			—			—			5			—			—			—			5
Equity-based compensation expense		—			17			—			—			17			—			—			—			17
Equity (gains) losses, including distributions		(132	)		(51	)		—			183			—			(41	)		(41	)		82			—
Changes in operating assets and liabilities:
Accounts receivable		—			(2	)		(39	)		—			(41	)		—			—			—			(41	)
Inventories		—			2			1			—			3			—			—			—			3
Royalty advances		—			(4	)		5			—			1			—			—			—			1
Accounts payable and accrued liabilities		—			(5	)		(4	)		(34	)		(43	)		—			—			—			(43	)
Royalty payables		—			54			21			—			75			—			—			—			75
Accrued interest		7			—			—			—			7			—			—			—			7
Deferred revenue		—			(34	)		30			—			(4	)		—			—			—			(4	)
Other balance sheet changes		7			10			(6	)		—			11			—			—			—			11
Net cash (used in) provided by operating activities		(49	)		205			70			—			226			—			—			—			226
Cash flows from investing activities
Acquisition of music publishing rights, net		—			(3	)		(3	)		—			(6	)		—			—			—			(6	)
Capital expenditures		—			(13	)		(5	)		—			(18	)		—			—			—			(18	)
Investments and acquisitions of businesses, net		—			(5	)		(1	)		—			(6	)		—			—			—			(6	)
Divestitures, net		—			7			11			—			18			—			—			—			18
Advances to issuer		87			—			—			(87	)		—			—			—			—			—
Net cash provided (used in) by investing activities		87			(14	)		2			(87	)		(12	)		—			—			—			(12	)
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp. 4.125% Senior Secured Notes		380			—			—			—			380			—			—			—			380
Proceeds from issuance of Acquisition Corp. 4.875% Senior Secured Notes		250			—			—			—			250			—			—			—			250
Proceeds from issuance of Acquisition Corp. Senior Term Loan Facility		22			—			—			—			22			—			—			—			22
Repayment of Acquisition Corp. 6.00% Senior Secured Notes		(450	)		—			—			—			(450	)		—			—			—			(450	)
Repayment of Acquisition Corp. 6.25% Senior Secured Notes		(173	)		—			—			—			(173	)		—			—			—			(173	)
Repayment of Acquisition Corp. 5.625% Senior Secured Notes		(28	)		—			—			—			(28	)		—			—			—			(28	)
Call premiums paid on early redemption of debt		(27	)		—			—			—			(27	)		—			—			—			(27	)
Deferred financing costs paid		(12	)		—			—			—			(12	)		—			—			—			(12	)
Distribution to noncontrolling interest holder		—			—			(1	)		—			(1	)		—			—			—			(1	)
Dividends paid		—			(54	)		—			—			(54	)		—			—			—			(54	)
Change in due to (from) issuer		—			(87	)		—			87			—			—			—			—			—
Net cash (used in) provided by financing activities		(38	)		(141	)		(1	)		87			(93	)		—			—			—			(93	)
Effect of exchange rate changes on cash and equivalents		—			—			(4	)		—			(4	)		—			—			—			(4	)
Net increase in cash and equivalents		—			50			67			—			117			—			—			—			117
Cash and equivalents at beginning of period		—			180			179			—			359			—			—			—			359
Cash and equivalents at end of period	$	—		$	230		$	246		$	—		$	476		$	—		$	—		$	—		$	476

The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2018
Accounting Policies [Abstract]
Interim Financial Statements	Interim Financial Statements The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and six month period ended March 31, 2018 are not necessarily indicative of the results that may be expected for the fiscal year ending September 30, 2018. The consolidated balance sheet at September 30, 2017 has been derived from the audited consolidated financial statements at that date but does not include all of the information and notes required by U.S. GAAP for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017 (File No. 001-32502).
Basis of Consolidation	Basis of Consolidation The accompanying financial statements present the consolidated accounts of all entities in which the Company has a controlling voting interest and/or variable interest required to be consolidated in accordance with U.S. GAAP. All intercompany balances and transactions have been eliminated. Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 810, Consolidation (“ASC 810”), requires the Company first evaluate its investments to determine if any investments qualify as a variable interest entity (“VIE”). A VIE is consolidated if the Company is deemed to be the primary beneficiary of the VIE, which is the party involved with the VIE that has both (i) the power to control the most significant activities of the VIE and (ii) either the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. If an entity is not deemed to be a VIE, the Company consolidates the entity if the Company has a controlling voting interest. The Company maintains a 52-53 week fiscal year ending on the last Friday in each reporting period. As such, all references to March 31, 2018 and March 31, 2017 relate to the periods ended March 30, 2018 and March 31, 2017, respectively. For convenience purposes, the Company continues to date its financial statements as of March 31. The fiscal year ended September 30, 2017 ended on September 29, 2017. The Company has performed a review of all subsequent events through the date the financial statements were issued, and has determined that no additional disclosures are necessary.
Income Taxes	Income Taxes At the end of each interim period, the Company makes its best estimate of the effective tax rate expected to be applicable for the full fiscal year and uses that rate to provide for income taxes on a current year-to-date basis before discrete items. If a reliable estimate of the annual effective tax rate cannot be made, which could be caused by the significant variability in rates when marginal earnings are expected for the year, a discrete tax rate is calculated for the period. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). In accordance with ASC Topic 740, Income Taxes (“ASC 740”) the Company recorded the impacts in the period of enactment.
New Accounting Pronouncements	New Accounting Pronouncements In October 2017, the Company adopted ASU 2016-09, Compensation - Stock Compensation ("ASU 2016-09"). This ASU provides amended guidance which simplifies the accounting for share-based payment transactions involving multiple aspects of the accounting for share-based transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The adoption of ASU 2016-09 did not have any effect on the Company’s consolidated financial statements and footnote disclosures as of March 31, 2018. In May 2014, the FASB issued guidance codified in ASC 606, Revenue from Contracts with Customers (“ASC 606”), which replaces the guidance in former ASC 605, Revenue Recognition and ASC 928-605, Entertainment – Music. The amendment was the result of a joint effort by the FASB and the International Accounting Standards Board to improve financial reporting by creating common revenue recognition guidance for U.S. GAAP and international financial reporting standards ("IFRS"). The joint project clarifies the principles for recognizing revenue and develops a common revenue standard for U.S. GAAP and IFRS. ASC 606 is effective for annual periods beginning after December 15, 2017, and interim periods within those years. Early adoption is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The update may be applied using one of two methods: retrospective application to each prior reporting period presented, or retrospective application with the cumulative effect of initially applying the update recognized at the date of initial application. The Company currently plans to adopt this ASU under the modified retrospective method. While the Company is currently evaluating the impact of adoption of this new standard on the consolidated financial statements, the Company believes the most significant impact will be a change in the timing of revenue recognition in our Music Publishing segment. The Company generally records revenue from the licensing of publishing rights when cash is received. Under the new revenue recognition rules, revenues will be recorded based on best estimates available in the period of sales or usage. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). This ASU will require that equity investments are measured at fair value with changes in fair value recognized in net income. The Company may elect to measure equity investments that do not have a readily determinable fair value at cost minus impairment, if any, plus or minus changes resulting from observable price. ASU 2016-01 will be effective for annual periods beginning after December 15, 2017, and interim periods within those years. Earlier adoption is permitted. The adoption of this standard is not expected to have a significant impact on the Company’s financial statements, other than disclosure. In February 2016, the FASB issued ASU 2016-02, Leases (“ASU 2016-02”). This ASU establishes a right-of-use (“ROU”) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the statement of operations. ASU 2016-02 will be effective for annual periods beginning after December 15, 2018, and interim periods within those years. Earlier adoption is permitted. The Company is evaluating the impact of the adoption of this standard on its financial statements and disclosures. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"). This ASU provides specific guidance of how certain cash receipts and cash payments should be presented and classified in the statement of cash flows. ASU 2016-15 is effective for annual periods beginning after December 15, 2017, and interim periods within those years. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on the Company’s financial statements, other than presentation. In October 2016, the FASB issued ASU 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16"). This ASU requires the recognition of current and deferred income taxes for intra-entity asset transfers when the transaction occurs. ASU 2016-16 is effective for annual periods beginning after December 15, 2017, and interim periods within those years. Early adoption is permitted using the modified retrospective approach with a cumulative-effect to opening retained earnings in the period of adoption. The Company does not plan to early adopt this standard and the impact upon the required adoption date is not known or reasonably estimable. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). This ASU improves certain aspects of the hedge accounting model including making more risk management strategies eligible for hedge accounting and simplifying the assessment of hedge effectiveness. ASU 2017-12 is effective for all annual periods beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted and requires a prospective adoption with a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption for existing hedging relationships. The Company is evaluating the impact of the adoption of this standard on its financial statements and disclosures. In February 2018, FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (“ASU 2018-02”). This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. ASU 2018-02 is effective for all entities for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. The Company is evaluating the impact of the adoption of this standard on its financial statements and disclosures. In March 2018, the FASB issued ASU 2018-5, Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (“ASU 2018-05”). This ASU allows companies, for one year following the enactment date, to consider the impact of the Tax Act as “provisional” when a company can make a reasonable estimate but does not have the necessary information available, prepared or analyzed in reasonable detail to finalize its accounting for the impact of the Tax Act. A company may need to reflect adjustments to its provisional amounts upon obtaining, preparing or analyzing additional information about facts and circumstances that existed at the period of enactment. The Company has adopted this standard on its financial statements and disclosures. Provisional amounts are identified in Note 7 of our Consolidated Financial Statements.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

Schedule of Accumulated Other Comprehensive Loss

Comprehensive Income (Loss) (Tables)

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

	Foreign			Minimum			Deferred Income		Accumulated
	Currency			Pension			On Derivative		Other
	Translation			Liability			Financial		Comprehensive
	(Loss) Gain (a)			Adjustment			Instruments		Loss, net
	(in millions)
Balance at September 30, 2017	$	(171	)	$	(10	)	$	—	$	(181	)
Other comprehensive income		18			—			2		20
Amounts reclassified from accumulated other comprehensive income		—			—			—		—
Balance at March 31, 2018	$	(153	)	$	(10	)	$	2	$	(161	)

(a)	Includes historical foreign currency translation related to certain intra-entity transactions that are no longer considered of a long-term investment nature.

Goodwill and Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill for Each Reportable Segment

The following analysis details the changes in goodwill for each reportable segment:

	Recorded		Music
	Music		Publishing		Total
	(in millions)
Balance at September 30, 2017	$	1,221	$	464	$	1,685
Acquisitions		—		—		—
Divestitures		—		—		—
Other adjustments (a)		11		—		11
Balance at March 31, 2018	$	1,232	$	464	$	1,696

(a)	Other adjustments during the six months ended March 31, 2018 represent foreign currency movements.

Schedule of Intangible Assets

Intangible assets consist of the following:

	Weighted
	Average	March 31,			September 30,
	Useful Life	2018			2017
		(in millions)
Intangible assets subject to amortization:
Recorded music catalog	10 years	$	920		$	898
Music publishing copyrights	27 years		1,564			1,534
Artist and songwriter contracts	13 years		924			904
Trademarks	6 years		14			14
Other intangible assets	7 years		17			10
Total gross intangible asset subject to amortization			3,439			3,360
Accumulated amortization			(1,402	)		(1,270	)
Total net intangible assets subject to amortization			2,037			2,090
Intangible assets not subject to amortization:
Trademarks and tradenames	Indefinite		118			117
Total net intangible assets		$	2,155		$	2,207

Debt (Tables)

6 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Long-term Debt

Long-term debt consists of the following:

	March 31,		September 30,
	2018		2017
	(in millions)
Revolving Credit Facility—Acquisition Corp. (a)	$	—	$	—
Senior Term Loan Facility due 2023—Acquisition Corp. (b)		1,307		990
5.625% Senior Secured Notes due 2022—Acquisition Corp. (c)		246		246
5.00% Senior Secured Notes due 2023—Acquisition Corp. (d)		297		297
4.125% Senior Secured Notes due 2024— Acquisition Corp. (e)		419		402
4.875% Senior Secured Notes due 2024— Acquisition Corp. (f)		247		246
6.75% Senior Notes due 2022—Acquisition Corp. (g)		111		630
5.50% Senior Notes due 2026—Acquisition Corp. (h)		320		—
Total debt (i)		2,947		2,811
Less: current portion		111		—
Total long-term debt	$	2,836	$	2,811

(a)

(b)	Principal amount of $1.326 billion and $1.006 billion less unamortized discount of $5 million and $6 million and unamortized deferred financing costs of $14 million and $10 million at March 31, 2018 and September 30, 2017, respectively.

(c)	Principal amount of $248 million less unamortized deferred financing costs of $2 million at both March 31, 2018 and September 30, 2017.

(d)	Principal amount of $300 million less unamortized deferred financing costs of $3 million at both March 31, 2018 and September 30, 2017.

(e)

(f)	Principal amount of $250 million at both March 31, 2018 and September 30, 2017 less unamortized deferred financing costs of $3 million and $4 million at March 31, 2018 and September 30, 2017, respectively.

(g)

(h)	Principal amount of $325 million less unamortized deferred financing costs of $5 million at March 31, 2018.

(i)	Principal amount of debt of $2.985 billion and $2.846 billion less unamortized discount of $5 million and $6 million and unamortized deferred financing costs of $33 million and $29 million at March 31, 2018 and September 30, 2017, respectively.

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Derivative Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2018

Summary of Amounts Recorded in Consolidated Balance Sheet

The following is a summary of amounts recorded in the Consolidated Balance Sheet pertaining to the Company’s designated cash flows hedges at March 31, 2018 and September 30, 2017:

	March 31,		September 30,
	2018 (a)		2017
	(in millions)
Other current assets	$	2	$	—
Other current liabilities		3		—
Other noncurrent assets		—		—
Other noncurrent liabilities		1		—

Segment Information (Tables)

6 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Information

					Corporate
	Recorded		Music		expenses and
	Music		Publishing		eliminations			Total
Three Months Ended	(in millions)
March 31, 2018
Revenues	$	791	$	174	$	(2	)	$	963
Operating income (loss)		80		41		(38	)		83
Amortization of intangible assets		38		17		—			55
Depreciation of property, plant and equipment		9		2		3			14
OIBDA		127		60		(35	)		152
March 31, 2017
Revenues	$	686	$	145	$	(6	)	$	825
Operating income (loss)		69		41		(32	)		78
Amortization of intangible assets		34		16		—			50
Depreciation of property, plant and equipment		9		1		3			13
OIBDA		112		58		(29	)		141

					Corporate
	Recorded		Music		expenses and
	Music		Publishing		eliminations			Total
Six Months Ended	(in millions)
March 31, 2018
Revenues	$	1,695	$	317	$	(4	)	$	2,008
Operating income (loss)		209		40		(76	)		173
Amortization of intangible assets		74		34		—			108
Depreciation of property, plant and equipment		17		3		6			26
OIBDA		300		77		(70	)		307
March 31, 2017
Revenues	$	1,483	$	269	$	(10	)	$	1,742
Operating income (loss)		192		39		(59	)		172
Amortization of intangible assets		69		32		—			101
Depreciation of property, plant and equipment		16		3		6			25
OIBDA		277		74		(53	)		298

Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Instruments

	Fair Value Measurements as of March 31, 2018
	(Level 1)		(Level 2)			(Level 3)			Total
	(in millions)
Other Current Assets:
Foreign Currency Forward Exchange Contracts (a)	$	—	$	2		$	—		$	2
Other Current Liabilities:
Foreign Currency Forward Exchange Contracts (a)		—		(3	)		—			(3	)
Other Current Liabilities:
Contractual Obligations (b)		—		—			—			—
Other Non-Current Liabilities:
Contractual Obligations (b)		—		—			(6	)		(6	)
Interest Rate Swap (c)		—		(1	)		—			(1	)
Total	$	—	$	(2	)	$	(6	)	$	(8	)

	Fair Value Measurements as of September 30, 2017
	(Level 1)		(Level 2)		(Level 3)			Total
	(in millions)
Other Current Liabilities:
Contractual Obligations (b)		—		—		—			—
Other Non-Current Liabilities:
Contractual Obligations (b)		—		—		(5	)		(5	)
Total	$	—	$	—	$	(5	)	$	(5	)

(a)	The fair value of foreign currency forward exchange contracts is based on dealer quotes of market forward rates and reflects the amount that the Company would receive or pay at their maturity dates for contracts involving the same currencies and maturity dates.

(b)

(c)	The fair value of the interest rate swap is based on dealer quotes of market forward rates and reflects the amount that the Company would receive or pay as of March 31, 2018 for contracts involving the same attributes and maturity dates.

Reconciliation of Net Liabilities Classified as Level 3

The following table reconciles the beginning and ending balances of net assets and liabilities classified as Level 3:

	Total
	(in millions)
Balance at September 30, 2017		(5	)
Additions		(1	)
Reductions		—
Payments		—
Balance at March 31, 2018	$	(6	)

Guarantor and Non-Guarantor Subsidiaries Financial Information Unaudited (Tables)

6 Months Ended

Mar. 31, 2018

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Schedule of Consolidating Balance Sheet

Consolidating Balance Sheet (Unaudited)

March 31, 2018

	WMG											WMG				Warner					Warner
	Acquisition					Non-						Acquisition		WMG		Music					Music
	Corp.		Guarantor			Guarantor						Corp.		Holdings		Group					Group Corp.
	(issuer)		Subsidiaries			Subsidiaries			Eliminations			Consolidated		Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Assets:
Current assets:
Cash and equivalents	$	—	$	329		$	283		$	—		$	612	$	—	$	—	$	—		$	612
Redemption deposit		119		—			—			—			119		—		—		—			119
Accounts receivable, net		—		230			197			—			427		—		—		—			427
Inventories		—		14			25			—			39		—		—		—			39
Royalty advances expected to be recouped within one year		—		98			50			—			148		—		—		—			148
Prepaid and other current assets		—		12			50			—			62		—		—		—			62
Total current assets		119		683			605			—			1,407		—		—		—			1,407
Due (to) from parent companies		518		(49	)		(469	)		—			—		—		—		—			—
Investments in and advances to consolidated subsidiaries		2,520		1,630			—			(4,150	)		—		398		398		(796	)		—
Royalty advances expected to be recouped after one year		—		120			61			—			181		—		—		—			181
Property, plant and equipment, net		—		138			76			—			214		—		—		—			214
Goodwill		—		1,368			328			—			1,696		—		—		—			1,696
Intangible assets subject to amortization, net		—		992			1,045			—			2,037		—		—		—			2,037
Intangible assets not subject to amortization		—		71			47			—			118		—		—		—			118
Deferred tax assets, net		—		44			8			—			52		—		—		—			52
Other assets		8		50			19			—			77		—		—		—			77
Total assets	$	3,165	$	5,047		$	1,720		$	(4,150	)	$	5,782	$	398	$	398	$	(796	)	$	5,782
Liabilities and Deficit:
Current liabilities:
Accounts payable	$	1	$	126		$	76		$	—		$	203	$	—	$	—	$	—		$	203
Accrued royalties		—		785			573			—			1,358		—		—		—			1,358
Accrued liabilities		—		155			185			—			340		—		—		—			340
Accrued interest		27		—			—			—			27		—		—		—			27
Deferred revenue		—		146			51			—			197		—		—		—			197
Current portion of long-term debt		111		—			—			—			111		—		—		—			111
Other current liabilities		—		5			32			—			37		—		—		—			37
Total current liabilities		139		1,217			917			—			2,273		—		—		—			2,273
Long-term debt		2,836		—			—			—			2,836		—		—		—			2,836
Deferred tax liabilities, net		—		—			194			—			194		—		—		—			194
Other noncurrent liabilities		1		156			117			—			274		—		—		—			274
Total liabilities		2,976		1,373			1,228			—			5,577		—		—		—			5,577
Total Warner Music Group Corp. equity		189		3,669			481			(4,150	)		189		398		398		(796	)		189
Noncontrolling interest		—		5			11			—			16		—		—		—			16
Total equity		189		3,674			492			(4,150	)		205		398		398		(796	)		205
Total liabilities and equity	$	3,165	$	5,047		$	1,720		$	(4,150	)	$	5,782	$	398	$	398	$	(796	)	$	5,782

Consolidating Balance Sheet

September 30, 2017

	WMG										WMG				Warner					Warner
	Acquisition				Non-						Acquisition		WMG		Music					Music
	Corp.		Guarantor		Guarantor						Corp.		Holdings		Group					Group Corp.
	(issuer)		Subsidiaries		Subsidiaries			Eliminations			Consolidated		Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Assets:
Current assets:
Cash and equivalents	$	—	$	347	$	300		$	—		$	647	$	—	$	—	$	—		$	647
Accounts receivable, net		—		214		190			—			404		—		—		—			404
Inventories		—		12		27			—			39		—		—		—			39
Royalty advances expected to be recouped within one year		—		89		52			—			141		—		—		—			141
Prepaid and other current assets		—		15		29			—			44		—		—		—			44
Total current assets		—		677		598			—			1,275		—		—		—			1,275
Due from (to) parent companies		418		96		(514	)		—			—		—		—		—			—
Investments in and advances to consolidated subsidiaries		2,721		1,312		—			(4,033	)		—		377		377		(754	)		—
Royalty advances expected to be recouped after one year		—		109		63			—			172		—		—		—			172
Property, plant and equipment, net		—		139		74			—			213		—		—		—			213
Goodwill		—		1,368		317			—			1,685		—		—		—			1,685
Intangible assets subject to amortization, net		—		1,029		1,061			—			2,090		—		—		—			2,090
Intangible assets not subject to amortization		—		71		46			—			117		—		—		—			117
Deferred tax assets, net		—		89		8			—			97		—		—		—			97
Other assets		7		45		17			—			69		—		—		—			69
Total assets	$	3,146	$	4,935	$	1,670		$	(4,033	)	$	5,718	$	377	$	377	$	(754	)	$	5,718
Liabilities and Deficit:
Current liabilities:
Accounts payable	$	—	$	135	$	73		$	—		$	208	$	—	$	—	$	—		$	208
Accrued royalties		—		732		531			—			1,263		—		—		—			1,263
Accrued liabilities		—		144		221			—			365		—		—		—			365
Accrued interest		41		—		—			—			41		—		—		—			41
Deferred revenue		—		125		72			—			197		—		—		—			197
Other current liabilities		—		3		23			—			26		—		—		—			26
Total current liabilities		41		1,139		920			—			2,100		—		—		—			2,100
Long-term debt		2,811		—		—			—			2,811		—		—		—			2,811
Deferred tax liabilities, net		—		—		190			—			190		—		—		—			190
Other noncurrent liabilities		1		196		112			—			309		—		—		—			309
Total liabilities		2,853		1,335		1,222			—			5,410		—		—		—			5,410
Total Warner Music Group Corp. equity		293		3,596		437			(4,033	)		293		377		377		(754	)		293
Noncontrolling interest		—		4		11			—			15		—		—		—			15
Total equity		293		3,600		448			(4,033	)		308		377		377		(754	)		308
Total liabilities and equity	$	3,146	$	4,935	$	1,670		$	(4,033	)	$	5,718	$	377	$	377	$	(754	)	$	5,718

Schedule of Consolidating Statement of Operations

Consolidating Statement of Operations (Unaudited)

For The Three Months Ended March 31, 2018

	WMG												WMG						Warner					Warner
	Acquisition						Non-						Acquisition			WMG			Music					Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group					Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations		Consolidated
	(in millions)
Revenues	$	—		$	535		$	549		$	(121	)	$	963		$	—		$	—		$	—	$	963
Costs and expenses:
Cost of revenue		—			(242	)		(327	)		81			(488	)		—			—			—		(488	)
Selling, general and administrative expenses		—			(244	)		(135	)		42			(337	)		—			—			—		(337	)
Amortization of intangible assets		—			(23	)		(32	)		—			(55	)		—			—			—		(55	)
Total costs and expenses		—			(509	)		(494	)		123			(880	)		—			—			—		(880	)
Operating income		—			26			55			2			83			—			—			—		83
Loss on extinguishment of debt		(23	)		—			—			—			(23	)		—			—			—		(23	)
Interest expense, net		(31	)		—			(5	)		—			(36	)		—			—			—		(36	)
Equity gains (losses) from equity method investments		66			33			—			(99	)		—			(3	)		(3	)		6		—
Other expense, net		4			(1	)		(9	)		—			(6	)		—			—			—		(6	)
Income (loss) before income taxes		16			58			41			(97	)		18			(3	)		(3	)		6		18
Income tax (expense) benefit		(19	)		(18	)		(18	)		36			(19	)		—			—			—		(19	)
Net (loss) income		(3	)		40			23			(61	)		(1	)		(3	)		(3	)		6		(1	)
Less: income attributable to noncontrolling interest		—			(1	)		(1	)		—			(2	)		—			—			—		(2	)
Net (loss) income attributable to Warner Music Group Corp.	$	(3	)	$	39		$	22		$	(61	)	$	(3	)	$	(3	)	$	(3	)	$	6	$	(3	)

Consolidating Statement of Operations (Unaudited)

For The Three Months Ended March 31, 2017

	WMG												WMG					Warner					Warner
	Acquisition						Non-						Acquisition			WMG		Music					Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Revenues	$	—		$	470		$	439		$	(84	)	$	825		$	—	$	—	$	—		$	825
Costs and expenses:
Cost of revenue		—			(204	)		(268	)		57			(415	)		—		—		—			(415	)
Selling, general and administrative expenses		—			(199	)		(110	)		27			(282	)		—		—		—			(282	)
Amortization of intangible assets		—			(26	)		(24	)		—			(50	)		—		—		—			(50	)
Total costs and expenses		—			(429	)		(402	)		84			(747	)		—		—		—			(747	)
Operating income		—			41			37			—			78			—		—		—			78
Interest (expense) income, net		(21	)		1			(16	)		—			(36	)		—		—		—			(36	)
Equity gains (losses) from equity method investments		49			11			—			(60	)		—			19		19		(38	)		—
Other expense, net		(6	)		—			(13	)		—			(19	)		—		—		—			(19	)
Income before income taxes		22			53			8			(60	)		23			19		19		(38	)		23
Income tax (expense) benefit		(3	)		(4	)		(7	)		11			(3	)		—		—		—			(3	)
Net income		19			49			1			(49	)		20			19		19		(38	)		20
Less: income attributable to noncontrolling interest		—			—			(1	)		—			(1	)		—		—		—			(1	)
Net income attributable to Warner Music Group Corp.	$	19		$	49		$	—		$	(49	)	$	19		$	19	$	19	$	(38	)	$	19

Consolidating Statement of Operations (Unaudited)

For The Six Months Ended March 31, 2018

	WMG												WMG					Warner					Warner
	Acquisition						Non-						Acquisition			WMG		Music					Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Revenues	$	—		$	1,082		$	1,170		$	(244	)	$	2,008		$	—	$	—	$	—		$	2,008
Costs and expenses:
Cost of revenue		—			(499	)		(720	)		162			(1,057	)		—		—		—			(1,057	)
Selling, general and administrative expenses		—			(479	)		(273	)		82			(670	)		—		—		—			(670	)
Amortization of intangible assets		—			(47	)		(61	)		—			(108	)		—		—		—			(108	)
Total costs and expenses		—			(1,025	)		(1,054	)		244			(1,835	)		—		—		—			(1,835	)
Operating income		—			57			116			—			173			—		—		—			173
Loss on extinguishment of debt		(24	)		—			—			—			(24	)		—		—		—			(24	)
Interest (expense) income, net		(60	)		1			(13	)		—			(72	)		—		—		—			(72	)
Equity gains (losses) from equity method investments		156			76			—			(232	)		—			1		1		(2	)		—
Other expense, net		—			9			(11	)		—			(2	)		—		—		—			(2	)
Income before income taxes		72			143			92			(232	)		75			1		1		(2	)		75
Income tax (expense) benefit		(71	)		(69	)		(28	)		97			(71	)		—		—		—			(71	)
Net income (loss)		1			74			64			(135	)		4			1		1		(2	)		4
Less: income attributable to noncontrolling interest		—			(1	)		(2	)		—			(3	)		—		—		—			(3	)
Net income attributable to Warner Music Group Corp.	$	1		$	73		$	62		$	(135	)	$	1		$	1	$	1	$	(2	)	$	1

Consolidating Statement of Operations (Unaudited)

For The Six Months Ended March 31, 2017

	WMG												WMG					Warner					Warner
	Acquisition						Non-						Acquisition			WMG		Music					Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Revenues	$	—		$	960		$	960		$	(178	)	$	1,742		$	—	$	—	$	—		$	1,742
Costs and expenses:
Cost of revenue		—			(424	)		(609	)		122			(911	)		—		—		—			(911	)
Selling, general and administrative expenses		(1	)		(375	)		(238	)		56			(558	)		—		—		—			(558	)
Amortization of intangible assets		—			(51	)		(50	)		—			(101	)		—		—		—			(101	)
Total costs and expenses		(1	)		(850	)		(897	)		178			(1,570	)		—		—		—			(1,570	)
Operating (loss) income		(1	)		110			63			—			172			—		—		—			172
Loss on extinguishment of debt		(32	)		—			—			—			(32	)		—		—		—			(32	)
Interest (expense) income, net		(44	)		2			(34	)		—			(76	)		—		—		—			(76	)
Equity gains (losses) from equity method investments		132			51			—			(183	)		—			41		41		(82	)		—
Other income (expense), net		6			3			(9	)		—			—			—		—		—			—
Income before income taxes		61			166			20			(183	)		64			41		41		(82	)		64
Income tax (expense) benefit		(20	)		(22	)		(16	)		38			(20	)		—		—		—			(20	)
Net income		41			144			4			(145	)		44			41		41		(82	)		44
Less: income attributable to noncontrolling interest		—			—			(3	)		—			(3	)		—		—		—			(3	)
Net income attributable to Warner Music Group Corp.	$	41		$	144		$	1		$	(145	)	$	41		$	41	$	41	$	(82	)	$	41

Schedule of Consolidating Statement of Comprehensive Income

Consolidating Statement of Comprehensive Income (Unaudited)

For The Three Months Ended March 31, 2018

	WMG												WMG						Warner						Warner
	Acquisition						Non-						Acquisition			WMG			Music						Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group						Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations			Consolidated
	(in millions)
Net (loss) income	$	(3	)	$	40		$	23		$	(61	)	$	(1	)	$	(3	)	$	(3	)	$	6		$	(1	)
Other comprehensive income (loss), net of tax:
Foreign currency adjustment		9			—			(9	)		9			9			9			9			(18	)		9
Deferred gains on derivative financial instruments		1			—			1			(1	)		1			1			1			(2	)		1
Other comprehensive income (loss), net of tax:		10			—			(8	)		8			10			10			10			(20	)		10
Total comprehensive income		7			40			15			(53	)		9			7			7			(14	)		9
Less: income attributable to noncontrolling interest		—			(1	)		(1	)		—			(2	)		—			—			—			(2	)
Comprehensive income attributable to Warner Music Group Corp.	$	7		$	39		$	14		$	(53	)	$	7		$	7		$	7		$	(14	)	$	7

Consolidating Statement of Comprehensive Income (Unaudited)

For The Three Months Ended March 31, 2017

	WMG										WMG					Warner					Warner
	Acquisition				Non-						Acquisition			WMG		Music					Music
	Corp.		Guarantor		Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)		Subsidiaries		Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Net income	$	19	$	49	$	1		$	(49	)	$	20		$	19	$	19	$	(38	)	$	20
Other comprehensive income, net of tax:
Foreign currency adjustment		24		—		(50	)		50			24			24		24		(48	)		24
Deferred gains on derivative financial instruments		1		1		—			(1	)		1			1		1		(2	)		1
Other comprehensive income, net of tax:		25		1		(50	)		49			25			25		25		(50	)		25
Total comprehensive income		44		50		(49	)		—			45			44		44		(88	)		45
Less: income attributable to noncontrolling interest		—		—		(1	)		—			(1	)		—		—		—			(1	)
Comprehensive income (loss) attributable to Warner Music Group Corp.	$	44	$	50	$	(50	)	$	—		$	44		$	44	$	44	$	(88	)	$	44

Consolidating Statement of Comprehensive Income (Unaudited)

For The Six Months Ended March 31, 2018

	WMG											WMG					Warner					Warner
	Acquisition					Non-						Acquisition			WMG		Music					Music
	Corp.		Guarantor			Guarantor						Corp.			Holdings		Group					Group Corp.
	(issuer)		Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.		Corp.		Eliminations			Consolidated
	(in millions)
Net income (loss)	$	1	$	74		$	64		$	(135	)	$	4		$	1	$	1	$	(2	)	$	4
Other comprehensive income (loss), net of tax:
Foreign currency adjustment		18		—			(18	)		18			18			18		18		(36	)		18
Deferred losses on derivative financial instruments		2		—			—			—			2			2		2		(4	)		2
Other comprehensive income (loss), net of tax:		20		—			(18	)		18			20			20		20		(40	)		20
Total comprehensive income (loss)		21		74			46			(117	)		24			21		21		(42	)		24
Less: income attributable to noncontrolling interest		—		(1	)		(2	)		—			(3	)		—		—		—			(3	)
Comprehensive income attributable to Warner Music Group Corp.	$	21	$	73		$	44		$	(117	)	$	21		$	21	$	21	$	(42	)	$	21

Consolidating Statement of Comprehensive Income (Unaudited)

For The Six Months Ended March 31, 2017

	WMG												WMG						Warner						Warner
	Acquisition						Non-						Acquisition			WMG			Music						Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group						Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations			Consolidated
	(in millions)
Net income	$	41		$	144		$	4		$	(145	)	$	44		$	41		$	41		$	(82	)	$	44
Other comprehensive (loss) income, net of tax:
Foreign currency adjustment		(13	)		—			(13	)		13			(13	)		(13	)		(13	)		26			(13	)
Deferred losses on derivative financial instruments		(1	)		(1	)		—			1			(1	)		(1	)		(1	)		2			(1	)
Other comprehensive (loss) income, net of tax:		(14	)		(1	)		(13	)		14			(14	)		(14	)		(14	)		28			(14	)
Total comprehensive income (loss)		27			143			(9	)		(131	)		30			27			27			(54	)		30
Less: income attributable to noncontrolling interest		—			—			(3	)		—			(3	)		—			—			—			(3	)
Comprehensive income (loss) attributable to Warner Music Group Corp.	$	27		$	143		$	(12	)	$	(131	)	$	27		$	27		$	27		$	(54	)	$	27

Schedule of Consolidating Statement of Cash Flows

Consolidating Statement of Cash Flows (Unaudited)

For The Six Months Ended March 31, 2018

	WMG												WMG						Warner						Warner
	Acquisition						Non-						Acquisition			WMG			Music						Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group						Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations			Consolidated
	(in millions)
Cash flows from operating activities
Net income (loss)	$	1		$	74		$	64		$	(135	)	$	4		$	1		$	1		$	(2	)	$	4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		—			67			67			—			134			—			—			—			134
Unrealized losses and remeasurement of foreign denominated loans		17			3			(9	)		—			11			—			—			—			11
Deferred income taxes		—			—			38			—			38			—			—			—			38
Loss on extinguishment of debt		24			—			—			—			24			—			—			—			24
Net (gain) loss on divestitures and investments		—			(7	)		—			—			(7	)		—			—			—			(7	)
Non-cash interest expense		3			—			—			—			3			—			—			—			3
Equity-based compensation expense		—			27			—			—			27			—			—			—			27
Equity (gains) losses, including distributions		(156	)		(76	)		—			232			—			(1	)		(1	)		2			—
Changes in operating assets and liabilities:
Accounts receivable		—			(16	)		1			—			(15	)		—			—			—			(15	)
Inventories		—			(1	)		2			—			1			—			—			—			1
Royalty advances		—			(20	)		8			—			(12	)		—			—			—			(12	)
Accounts payable and accrued liabilities		—			101			(104	)		(97	)		(100	)		—			—			—			(100	)
Royalty payables		—			48			20			—			68			—			—			—			68
Accrued interest		(14	)		—			—			—			(14	)		—			—			—			(14	)
Deferred revenue		—			9			(25	)		—			(16	)		—			—			—			(16	)
Other balance sheet changes		(4	)		43			(49	)		—			(10	)		—			—			—			(10	)
Net cash provided (used in) by operating activities		(129	)		252			13			—			136			—			—			—			136
Cash flows from investing activities
Acquisition of music publishing rights, net		—			(4	)		(1	)		—			(5	)		—			—			—			(5	)
Capital expenditures		—			(23	)		(6	)		—			(29	)		—			—			—			(29	)
Investments and acquisitions of businesses, net		—			(6	)		—			—			(6	)		—			—			—			(6	)
Proceeds from the sale of investments		—			12			—			—			12			—			—			—			12
Advances from issuer		151			—			—			(151	)		—			—			—			—			—
Net cash (used in) provided by investing activities		151			(21	)		(7	)		(151	)		(28	)		—			—			—			(28	)
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp. 5.50% Senior Notes		325			—			—			—			325			—			—			—			325
Proceeds from supplement of Acquisition Corp. Senior Term Loan Facility		320			—			—			—			320			—			—			—			320
Repayment of and redemption deposit for Acquisition Corp. 6.75% Senior Notes		(635	)		—			—			—			(635	)		—			—			—			(635	)
Call premiums paid on and redemption deposit for early redemption of debt		(23	)		—			—			—			(23	)		—			—			—			(23	)
Deferred financing costs paid		(9	)		—			—			—			(9	)		—			—			—			(9	)
Distribution to noncontrolling interest holder		—			—			(2	)		—			(2	)		—			—			—			(2	)
Dividends paid		—			(98	)		(27	)		—			(125	)		—			—			—			(125	)
Change in due to (from) issuer		—			(151	)		—			151			—			—			—			—			—
Net cash (used in) provided by financing activities		(22	)		(249	)		(29	)		151			(149	)		—			—			—			(149	)
Effect of exchange rate changes on cash and equivalents		—			—			6			—			6			—			—			—			6
Net decrease in cash and equivalents		—			(18	)		(17	)		—			(35	)		—			—			—			(35	)
Cash and equivalents at beginning of period		—			347			300			—			647			—			—			—			647
Cash and equivalents at end of period	$	—		$	329		$	283		$	—		$	612		$	—		$	—		$	—		$	612

Consolidating Statement of Cash Flows (Unaudited)

For The Six Months Ended March 31, 2017

	WMG												WMG						Warner						Warner
	Acquisition						Non-						Acquisition			WMG			Music						Music
	Corp.			Guarantor			Guarantor						Corp.			Holdings			Group						Group Corp.
	(issuer)			Subsidiaries			Subsidiaries			Eliminations			Consolidated			Corp.			Corp.			Eliminations			Consolidated
	(in millions)
Cash flows from operating activities
Net income	$	41		$	144		$	4		$	(145	)	$	44		$	41		$	41		$	(82	)	$	44
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		—			70			56			—			126			—			—			—			126
Unrealized (gains)/losses and remeasurement of foreign denominated loans		(11	)		(3	)		13			—			(1	)		—			—			—			(1	)
Deferred income taxes		2			2			(12	)		(4	)		(12	)		—			—			—			(12	)
Loss on extinguishment of debt		32			—			—			—			32			—			—			—			32
Net loss on divestiture and investments		—			5			1			—			6			—			—			—			6
Non-cash interest expense		5			—			—			—			5			—			—			—			5
Equity-based compensation expense		—			17			—			—			17			—			—			—			17
Equity (gains) losses, including distributions		(132	)		(51	)		—			183			—			(41	)		(41	)		82			—
Changes in operating assets and liabilities:
Accounts receivable		—			(2	)		(39	)		—			(41	)		—			—			—			(41	)
Inventories		—			2			1			—			3			—			—			—			3
Royalty advances		—			(4	)		5			—			1			—			—			—			1
Accounts payable and accrued liabilities		—			(5	)		(4	)		(34	)		(43	)		—			—			—			(43	)
Royalty payables		—			54			21			—			75			—			—			—			75
Accrued interest		7			—			—			—			7			—			—			—			7
Deferred revenue		—			(34	)		30			—			(4	)		—			—			—			(4	)
Other balance sheet changes		7			10			(6	)		—			11			—			—			—			11
Net cash (used in) provided by operating activities		(49	)		205			70			—			226			—			—			—			226
Cash flows from investing activities
Acquisition of music publishing rights, net		—			(3	)		(3	)		—			(6	)		—			—			—			(6	)
Capital expenditures		—			(13	)		(5	)		—			(18	)		—			—			—			(18	)
Investments and acquisitions of businesses, net		—			(5	)		(1	)		—			(6	)		—			—			—			(6	)
Divestitures, net		—			7			11			—			18			—			—			—			18
Advances to issuer		87			—			—			(87	)		—			—			—			—			—
Net cash provided (used in) by investing activities		87			(14	)		2			(87	)		(12	)		—			—			—			(12	)
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp. 4.125% Senior Secured Notes		380			—			—			—			380			—			—			—			380
Proceeds from issuance of Acquisition Corp. 4.875% Senior Secured Notes		250			—			—			—			250			—			—			—			250
Proceeds from issuance of Acquisition Corp. Senior Term Loan Facility		22			—			—			—			22			—			—			—			22
Repayment of Acquisition Corp. 6.00% Senior Secured Notes		(450	)		—			—			—			(450	)		—			—			—			(450	)
Repayment of Acquisition Corp. 6.25% Senior Secured Notes		(173	)		—			—			—			(173	)		—			—			—			(173	)
Repayment of Acquisition Corp. 5.625% Senior Secured Notes		(28	)		—			—			—			(28	)		—			—			—			(28	)
Call premiums paid on early redemption of debt		(27	)		—			—			—			(27	)		—			—			—			(27	)
Deferred financing costs paid		(12	)		—			—			—			(12	)		—			—			—			(12	)
Distribution to noncontrolling interest holder		—			—			(1	)		—			(1	)		—			—			—			(1	)
Dividends paid		—			(54	)		—			—			(54	)		—			—			—			(54	)
Change in due to (from) issuer		—			(87	)		—			87			—			—			—			—			—
Net cash (used in) provided by financing activities		(38	)		(141	)		(1	)		87			(93	)		—			—			—			(93	)
Effect of exchange rate changes on cash and equivalents		—			—			(4	)		—			(4	)		—			—			—			(4	)
Net increase in cash and equivalents		—			50			67			—			117			—			—			—			117
Cash and equivalents at beginning of period		—			180			179			—			359			—			—			—			359
Cash and equivalents at end of period	$	—		$	230		$	246		$	—		$	476		$	—		$	—		$	—		$	476

Description of Business - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2018 Country Musical_composition songwriters
Accounting Policies [Abstract]
Number of countries in which Recorded Music activity conducted \| Country	50
Minimum number of musical compositions on which Company owns or controls rights \| Musical_composition	1,000,000
Number of songwriters and composers \| songwriters	70,000

Comprehensive Income (Loss) - Additional Information (Detail) $ in Millions	6 Months Ended
	Mar. 31, 2018 USD ($)
Maximum
Accumulated Other Comprehensive Income Loss [Line Items]
Changes in accumulated other comprehensive loss, net of related taxes	$ 1

Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Detail)
$ in Millions

6 Months Ended

Mar. 31, 2018

USD ($)

Accumulated Other Comprehensive Income Loss [Line Items]

$ 308

Foreign Currency Translation (Loss) Gain

205

Accumulated Other Comprehensive Income Loss [Line Items]

Other comprehensive income

(171)

^[1]

^[1]

Minimum Pension Liability Adjustment

(153)

^[1]

Accumulated Other Comprehensive Income Loss [Line Items]

(10)

Deferred Income On Derivative Financial Instruments

(10)

Accumulated Other Comprehensive Income Loss [Line Items]

Other comprehensive income

Accumulated Other Comprehensive Loss, net

Accumulated Other Comprehensive Income Loss [Line Items]

Other comprehensive income

(181)

$ (161)

[1]	Includes historical foreign currency translation related to certain intra-entity transactions that are no longer considered of a long-term investment nature.

Goodwill and Intangible Assets - Changes in Goodwill for Each Reportable Segment (Detail)
$ in Millions

6 Months Ended

Mar. 31, 2018

USD ($)

Goodwill [Line Items]

$ 1,685

^[1]

1,696

Goodwill [Line Items]

1,221

^[1]

1,232

Goodwill [Line Items]

464

$ 464

[1]	Other adjustments during the six months ended March 31, 2018 represent foreign currency movements.

Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Total gross intangible asset subject to amortization	$ 3,439	$ 3,360
Accumulated amortization	(1,402)	(1,270)
Total net intangible assets subject to amortization	2,037	2,090
Intangible assets not subject to amortization	118	117
Total net intangible assets	2,155	2,207
Trademarks and tradenames
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	$ 118	117
Recorded music catalog
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	10 years
Total gross intangible asset subject to amortization	$ 920	898
Music publishing copyrights
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	27 years
Total gross intangible asset subject to amortization	$ 1,564	1,534
Artist and songwriter contracts
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	13 years
Total gross intangible asset subject to amortization	$ 924	904
Trademarks
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	6 years
Total gross intangible asset subject to amortization	$ 14	14
Other Intangible Assets
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	7 years
Total gross intangible asset subject to amortization	$ 17	$ 10

Debt - Long-term Debt (Detail) - USD ($)
$ in Millions

Mar. 31, 2018

Sep. 30, 2017

Current portion of long-term debt

^[1]

$ 2,947

$ 2,811

111

Long-term debt

2,836

2,811

Acquisition Corp. | Senior Term Loan Facility due 2023

Acquisition Corp. | 5.00% Senior Secured Notes due 2023

^[2]

1,307

990

Acquisition Corp. | 5.625% Senior Secured Notes due 2022

^[3]

297

Acquisition Corp. | 4.125% Senior Secured Notes due 2024

^[4]

246

Acquisition Corp. | 4.875% Senior Secured Notes due 2024

^[5]

419

402

Acquisition Corp. | 6.75% Senior Notes due 2022

^[6]

247

246

Acquisition Corp. | 5.50% Senior Notes due 2026

^[7]

111

$ 630

^[8]

$ 320

[1]	Principal amount of debt of $2.985 billion and $2.846 billion less unamortized discount of $5 million and $6 million and unamortized deferred financing costs of $33 million and $29 million at March 31, 2018 and September 30, 2017, respectively.
[2]	Principal amount of $1.326 billion and $1.006 billion less unamortized discount of $5 million and $6 million and unamortized deferred financing costs of $14 million and $10 million at March 31, 2018 and September 30, 2017, respectively.
[3]	Principal amount of $300 million less unamortized deferred financing costs of $3 million at both March 31, 2018 and September 30, 2017.
[4]	Principal amount of $248 million less unamortized deferred financing costs of $2 million at both March 31, 2018 and September 30, 2017.
[5]	Face amount of €345 million. Above amounts represent the dollar equivalent of such notes at March 31, 2018 and September 30, 2017. Principal amount of $424 million and $407 million at March 31, 2018 and September 30, 2017, respectively, less unamortized deferred financing costs of $5 million at both March 31, 2018 and September 30, 2017.
[6]	Principal amount of $250 million at both March 31, 2018 and September 30, 2017 less unamortized deferred financing costs of $3 million and $4 million at March 31, 2018 and September 30, 2017, respectively.
[7]	Principal amount of $112 million and $635 million less unamortized deferred financing costs of $1 million and $5 million at March 31, 2018 and September 30, 2017, respectively. Reflects amount not redeemed as of March 31, 2018 as described below under “Tender Offer and Notes Redemption.” The remaining 6.75% Senior Notes were redeemed on April 15, 2018.
[8]	Principal amount of $325 million less unamortized deferred financing costs of $5 million at March 31, 2018.

Debt - Long-term Debt (Parenthetical) (Detail) € in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Apr. 15, 2018	Mar. 31, 2018 EUR (€)	Mar. 14, 2018 USD ($)	Sep. 30, 2017 EUR (€)	Mar. 31, 2017
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 2,985,000,000	$ 2,846,000,000
Unamortized discount	5,000,000	6,000,000
Unamortized deferred financing costs	33,000,000	29,000,000
Acquisition Corp. \| Revolving Credit Facility
Debt Instrument [Line Items]
Commitments under revolving credit facility	180,000,000	150,000,000
Letters of credit outstanding	12,000,000	12,000,000
Revolving credit facility outstanding	$ 0	$ 0
Senior Term Loan Facility due 2023 \| Acquisition Corp.
Debt Instrument [Line Items]
Due date of senior secured notes	2023	2023
Face or principal amount of debt instrument	$ 1,326,000,000	$ 1,006,000,000
Unamortized discount	5,000,000	6,000,000
Unamortized deferred financing costs	$ 14,000,000	$ 10,000,000
5.00% Senior Secured Notes due 2023 \| Acquisition Corp.
Debt Instrument [Line Items]
Due date of senior secured notes	2023	2023
Interest rate	5.00%	5.00%		5.00%		5.00%
Face or principal amount of debt instrument	$ 300,000,000	$ 300,000,000
Unamortized deferred financing costs	$ 3,000,000	$ 3,000,000
4.125% Senior Secured Notes due 2024 \| Acquisition Corp.
Debt Instrument [Line Items]
Due date of senior secured notes	2024	2024
Interest rate	4.125%	4.125%		4.125%		4.125%
Face or principal amount of debt instrument	$ 424,000,000	$ 407,000,000		€ 345		€ 345
Unamortized deferred financing costs	$ 5,000,000	$ 5,000,000
4.875% Senior Secured Notes due 2024 \| Acquisition Corp.
Debt Instrument [Line Items]
Due date of senior secured notes	2024	2024
Interest rate	4.875%	4.875%		4.875%		4.875%
Face or principal amount of debt instrument	$ 250,000,000	$ 250,000,000
Unamortized deferred financing costs	$ 3,000,000	$ 4,000,000
6.75% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate	6.75%			6.75%	6.75%		6.75%
Face or principal amount of debt instrument					$ 523,000,000
6.75% Senior Notes due 2022 \| Acquisition Corp.
Debt Instrument [Line Items]
Due date of senior secured notes	2022	2022
Interest rate	6.75%	6.75%	6.75%	6.75%		6.75%
Face or principal amount of debt instrument	$ 112,000,000	$ 635,000,000			$ 112,000,000
Unamortized deferred financing costs	$ 1,000,000	$ 5,000,000
5.50% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate	5.50%			5.50%
5.50% Senior Notes due 2022 \| Acquisition Corp.
Debt Instrument [Line Items]
Due date of senior secured notes	2026	2026
Interest rate	5.50%	5.50%		5.50%		5.50%
Face or principal amount of debt instrument	$ 325,000,000
Unamortized deferred financing costs	$ 5,000,000
5.625% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate	5.625%			5.625%			5.625%
5.625% Senior Secured Notes \| Acquisition Corp.
Debt Instrument [Line Items]
Due date of senior secured notes	2022	2022
Interest rate	5.625%	5.625%		5.625%		5.625%
Face or principal amount of debt instrument	$ 248,000,000	$ 248,000,000
Unamortized deferred financing costs	$ 2,000,000	$ 2,000,000

Debt - December 2017 Senior Term Loan Credit Agreement Amendment - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	May 22, 2017	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ (23)	$ (24)	$ (32)
December 2017 Senior Term Loan Credit Agreement Amendment
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ (1)

Debt - New Revolving Credit Agreement - Additional Information (Detail) - New Revolving Credit Agreement - Revolving Credit Facility $ in Millions	Jan. 31, 2018 USD ($)
Debt Instrument [Line Items]
Debt instrument, agreement date	Jan. 31, 2018
Credit agreement covenant terms	The Revolving Credit Agreement differs from the Old Revolving Credit Agreement in that it, among other things, reduces the interest rate margin applicable to the loans, extends the maturity date thereunder, provides for the option to increase the commitments under the Company’s then existing revolving credit agreement, provides for greater flexibility to amend and extend the Company’s then existing revolving credit agreement and create additional tranches thereunder, provides for greater flexibility over future amendments, increases the springing financial maintenance covenant to 4.75:1.00 and provides that the covenant shall not be tested unless at the end of a fiscal quarter the outstanding amount of loans and drawings under letters of credit which have not been reimbursed exceeds $54 million and aligns the other negative covenants with those of the Senior Term Loan Credit Agreement.
Debt instrument, springing financial maintenance covenant	4.75%
Maximum
Debt Instrument [Line Items]
Debt instrument, reimbursed amount	$ 54

Debt - March 2018 Senior Term Loan Credit Agreement Amendment - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 14, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 2,985		$ 2,846
March 2018 Senior Term Loan Credit Agreement Amendment
Debt Instrument [Line Items]
Face or principal amount of debt instrument		$ 320
Revolving credit facility outstanding		$ 1,326

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Other Current Liabilities

Debt - Notes Offering - Additional Information (Detail) - USD ($) $ in Millions	Mar. 14, 2018	Mar. 31, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Face or principal amount of debt instrument		$ 2,985	$ 2,846
5.50% Senior Notes due 2026
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 325
Due date of Senior Secured Notes	2026
Interest rate	5.50%

Debt - Tender Offer and Notes Redemption - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 14, 2018	Apr. 30, 2018	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Apr. 15, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Face or principal amount of debt instrument			$ 2,985	$ 2,985			$ 2,846
Redemption deposit			119	119
Loss on extinguishment of debt			$ (23)	$ (24)	$ (32)
6.75% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate	6.75%		6.75%	6.75%	6.75%
Face or principal amount of debt instrument	$ 523
Loss on extinguishment of debt	(23)	$ (5)
6.75% Senior Notes due 2022 \| Acquisition Corp.
Debt Instrument [Line Items]
Interest rate			6.75%	6.75%		6.75%	6.75%
Face or principal amount of debt instrument	112		$ 112	$ 112			$ 635
Redemption deposit	$ 119

Debt - Interest Rates - Additional Information (Detail)	6 Months Ended
Debt - Interest Rates - Additional Information (Detail)	Mar. 31, 2018
Senior Term Loan Facility due 2020
Debt Instrument [Line Items]
Description of variable rate basis	The loans under the Senior Term Loan Facility bear interest at Acquisition Corp.’s election at a rate equal to (i) the rate for deposits in U.S. dollars in the London interbank market (adjusted for maximum reserves) for the applicable interest period (“Term Loan LIBOR”) subject to a zero floor, plus 2.25% per annum, or (ii) the base rate, which is the highest of (x) the corporate base rate established by the administrative agent as its prime rate in effect at its principal office in New York City from time to time, (y) 0.50% in excess of the overnight federal funds rate and (z) one-month Term Loan LIBOR, plus 1.00% per annum, plus, in each case, 1.25% per annum.
Interest rate applicable to overdue principal	2.00%
Term loan Base rate plus Election Rate	1.00%
London Interbank Offered Rate (LIBOR) \| Senior Term Loan Facility due 2020
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	2.25%
Base Rate \| Senior Term Loan Facility due 2020
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	1.25%
Additional Interest rate on other overdue amounts	2.00%
Federal Funds Effective Swap Rate \| Senior Term Loan Facility due 2020
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	0.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	0.75%
Description of variable rate basis	The loans under the Revolving Credit Facility bear interest at Acquisition Corp.’s election at a rate equal to (i) the rate for deposits in the borrowing currency in the London interbank market (adjusted for maximum reserves) for the applicable interest period (“Revolving LIBOR”) subject to a zero floor, plus 1.75% per annum, or (ii) the base rate, which is the highest of (x) the corporate base rate established by the administrative agent from time to time, (y) 0.50% in excess of the overnight federal funds rate and (z) the one-month Revolving LIBOR plus 1.0% per annum, plus, in each case, 0.75% per annum. If there is a payment default at any time, then the interest rate applicable to overdue principal will be the rate otherwise applicable to such loan plus 2.0% per annum.
Interest rate applicable to overdue principal	2.00%
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	1.75%
Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	1.00%
Additional Interest rate on other overdue amounts	2.00%
Revolving Credit Facility \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	0.50%

Debt - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 14, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 2,985		$ 2,985			$ 2,846
Interest expense, net	$ 36	$ 36	$ 72	$ 76
Weighted-average interest rate of total debt	4.70%	4.90%	4.70%	4.90%		4.90%
Senior Notes
Debt Instrument [Line Items]
Scheduled maturities of long-term debt in 2022	$ 360		$ 360
Face or principal amount of debt instrument	$ 112		$ 112
Interest rate	6.75%		6.75%
Scheduled to mature	$ 1,299		$ 1,299
Revolving Credit Facility
Debt Instrument [Line Items]
Extended maturity date of credit facility			Jan. 31, 2023
Term Loan Facility
Debt Instrument [Line Items]
Credit facility maturity date			Nov. 01, 2023
6.75% Senior Notes
Debt Instrument [Line Items]
Face or principal amount of debt instrument					$ 523
Interest rate	6.75%	6.75%	6.75%	6.75%	6.75%
Weighted-average interest rate of total debt	4.60%		4.60%

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 29, 2015	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Commitments And Contingencies [Line Items]
Revenues		$ 963		$ 825	$ 2,008	$ 1,742
Sirius XM \| Settled Litigation
Commitments And Contingencies [Line Items]
Receipts from plaintiff	$ 210
Cash distribution								$ 33
Revenues			$ 1				$ 4	$ 28

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Contingency [Line Items]
U.S. corporate statutory tax rate		35.00%	35.00%		35.00%
Enacted tax rate	21.00%
Tax Act, provisional income tax expense		$ 26,000,000		$ 26,000,000
Tax Act, provisional deferred tax liability				$ 4,000,000
One-time transition tax on accumulated foreign earnings, tax rate for cash and cash equivalents				15.50%
One-time transition tax on accumulated foreign earnings, tax rate for illiquid assets				8.00%
Income tax liability related to Transition Tax	$ 0			$ 0
Income tax expense	19,000,000		$ 3,000,000	71,000,000	$ 20,000,000
Income withholding taxes and foreign losses uncertain tax positions	0		$ 0	0	$ 0
Maximum
Income Tax Contingency [Line Items]
Reasonably possible decrease in gross unrecognized tax benefits from ongoing audits and settlement	$ 3,000,000			$ 3,000,000
Scenario, Plan
Income Tax Contingency [Line Items]
U.S. corporate statutory tax rate						21.00%	21.00%	24.50%

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Derivatives Fair Value [Line Items]
Companys hedged interest rate transactions			5 years
Outstanding hedge contracts					$ 0
Deferred gains (losses) in comprehensive loss related to foreign exchange hedging					0
Deferred gains (losses) on derivative financial instruments	$ 1,000,000	$ 1,000,000	$ 2,000,000	$ (1,000,000)
Pre-tax gains and losses of the company derivative interest rate			1,000,000		0
Maximum
Derivatives Fair Value [Line Items]
Unrealized deferred income in comprehensive income related to foreign exchange hedging			2,000,000
Interest Rate Swap
Derivatives Fair Value [Line Items]
Outstanding hedge contracts	320,000,000		320,000,000		0
Deferred gains (losses) on derivative financial instruments			1,000,000		$ 0
Sale
Derivatives Fair Value [Line Items]
Outstanding hedge contracts	197,000,000		197,000,000
Purchase
Derivatives Fair Value [Line Items]
Outstanding hedge contracts	$ 114,000,000		$ 114,000,000

Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheet (Detail)
$ in Millions

Mar. 31, 2018

USD ($)

^[1]

Other Current Assets

Derivatives Fair Value [Line Items]

Other assets

$ 2

^[2]

Derivatives Fair Value [Line Items]

Other liabilities

^[2]

Other Noncurrent Liabilities

Derivatives Fair Value [Line Items]

Other liabilities

$ 1

[1]	$5 million and $6 million of foreign exchange derivative contracts in asset and liability positions, respectively, and $1 million of interest rate swap in a liability position including non-designated cash flow hedges.
[2]	The fair value of foreign currency forward exchange contracts is based on dealer quotes of market forward rates and reflects the amount that the Company would receive or pay at their maturity dates for contracts involving the same currencies and maturity dates.

Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheet (Parenthetical) (Detail) $ in Millions	Mar. 31, 2018 USD ($)
Derivatives Fair Value [Line Items]
Foreign exchange derivative contracts in asset	$ 5
Foreign exchange derivative contracts in liability	6
Interest Rate Swap
Derivatives Fair Value [Line Items]
Foreign exchange derivative contracts in liability	$ 1

Segment Information - Additional Information (Detail)	6 Months Ended
Segment Information - Additional Information (Detail)	Mar. 31, 2018 Operations
Segment Reporting [Abstract]
Number of fundamental operations	2

Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 963	$ 825	$ 2,008	$ 1,742
Operating income	83	78	173	172
Amortization of intangible assets	55	50	108	101
Depreciation of property, plant and equipment	14	13	26	25
OIBDA	152	141	307	298
Operating Segments \| Recorded Music
Segment Reporting Information [Line Items]
Revenues	791	686	1,695	1,483
Operating income	80	69	209	192
Amortization of intangible assets	38	34	74	69
Depreciation of property, plant and equipment	9	9	17	16
OIBDA	127	112	300	277
Operating Segments \| Music Publishing
Segment Reporting Information [Line Items]
Revenues	174	145	317	269
Operating income	41	41	40	39
Amortization of intangible assets	17	16	34	32
Depreciation of property, plant and equipment	2	1	3	3
OIBDA	60	58	77	74
Corporate Expenses and Eliminations
Segment Reporting Information [Line Items]
Revenues	(2)	(6)	(4)	(10)
Operating income	(38)	(32)	(76)	(59)
Depreciation of property, plant and equipment	3	3	6	6
OIBDA	$ (35)	$ (29)	$ (70)	$ (53)

Additional Financial Information - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Supplemental Cash Flow Information [Abstract]
Accrued interest paid	$ 34	$ 17	$ 86	$ 64
Income taxes paid net of refunds	10	13	18	22
Tax refund	$ 1	$ 3	$ 1	$ 3

Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions

Mar. 31, 2018

Sep. 30, 2017

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

$ (5)

Total

$ (8)

Level 2

Total

(2)

Level 3

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

(5)

Total

(6)

Other Current Assets

Other Current Assets | Level 2

^[1],[2]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Other Current Liabilities

^[2]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Other Current Liabilities | Level 2

^[1],[2]

(3)

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Other Noncurrent Liabilities

^[2]

(3)

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

^[1]

(1)

Other Noncurrent Liabilities | Level 2

^[3]

(6)

(5)

Interest rate swap

^[3]

(1)

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Interest rate swap

^[3]

(1)

Other Noncurrent Liabilities | Level 3

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Condensed Income Statements Captions [Line Items]

^[3]

$ (6)

$ (5)

[1]	$5 million and $6 million of foreign exchange derivative contracts in asset and liability positions, respectively, and $1 million of interest rate swap in a liability position including non-designated cash flow hedges.
[2]	The fair value of foreign currency forward exchange contracts is based on dealer quotes of market forward rates and reflects the amount that the Company would receive or pay at their maturity dates for contracts involving the same currencies and maturity dates.
[3]	The fair value of the interest rate swap is based on dealer quotes of market forward rates and reflects the amount that the Company would receive or pay as of March 31, 2018 for contracts involving the same attributes and maturity dates.

Fair Value Measurements - Reconciliation of Net Liabilities Classified as Level 3 (Detail) - Level 3 $ in Millions	6 Months Ended
	Mar. 31, 2018 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at September 30, 2017	$ (5)
Additions	(1)
Balance at March 31, 2018	$ (6)

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Level 2 measurement
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	$ 3,027	$ 2,936

Subsequent Events - Additional Information (Detail) - Subsequent Event $ in Millions	May 07, 2018 USD ($)
Subsequent Event [Line Items]
Special cash dividends	$ 300
Special cash dividends payable, date to be paid	May 11, 2018
Special cash dividends payable, date of record	May 07, 2018
Spotify Technology S.A.
Subsequent Event [Line Items]
Sale of common shares, consideration received	$ 400
Pre-tax gain, net	$ 300

Guarantor and Non-Guarantor Subsidiaries Financial Information - Additional Information (Detail)		6 Months Ended	12 Months Ended
	Mar. 14, 2018	Mar. 31, 2018	Sep. 30, 2017	Apr. 15, 2018	Mar. 31, 2017
5.625% Senior Secured Notes due 2022
Condensed Financial Statements Captions [Line Items]
Interest rate		5.625%			5.625%
5.625% Senior Secured Notes due 2022 \| Acquisition Corp.
Condensed Financial Statements Captions [Line Items]
Interest rate		5.625%	5.625%
Due date of Senior Secured Notes		2022	2022
5.00% Senior Secured Notes due 2023 \| Acquisition Corp.
Condensed Financial Statements Captions [Line Items]
Interest rate		5.00%
Due date of Senior Secured Notes		2023
4.125% Senior Secured Notes due 2024 \| Acquisition Corp.
Condensed Financial Statements Captions [Line Items]
Interest rate		4.125%	4.125%
Due date of Senior Secured Notes		2024	2024
4.875% Senior Secured Notes due 2024 \| Acquisition Corp.
Condensed Financial Statements Captions [Line Items]
Interest rate		4.875%	4.875%
Due date of Senior Secured Notes		2024	2024
6.75% Senior Notes due 2022
Condensed Financial Statements Captions [Line Items]
Interest rate	6.75%	6.75%			6.75%
6.75% Senior Notes due 2022 \| Acquisition Corp.
Condensed Financial Statements Captions [Line Items]
Interest rate		6.75%	6.75%	6.75%
Due date of Senior Secured Notes		2022	2022
5.50% Senior Notes due 2026
Condensed Financial Statements Captions [Line Items]
Interest rate	5.50%
Due date of Senior Secured Notes	2026
5.50% Senior Notes due 2026 \| Acquisition Corp.
Condensed Financial Statements Captions [Line Items]
Interest rate		5.50%
Due date of Senior Secured Notes		2026

Guarantor and Non-Guarantor Subsidiaries Financial Information - Consolidating Balance Sheet Unaudited (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Current assets:
Cash and equivalents	$ 612	$ 647	$ 476	$ 359
Redemption deposit	119
Accounts receivable, net	427	404
Inventories	39	39
Royalty advances expected to be recouped within one year	148	141
Prepaid and other current assets	62	44
Total current assets	1,407	1,275
Royalty advances expected to be recouped after one year	181	172
Property, plant and equipment, net	214	213
Goodwill	1,696	1,685
Intangible assets subject to amortization, net	2,037	2,090
Intangible assets not subject to amortization	118	117
Deferred tax assets, net	52	97
Other assets	77	69
Total assets	5,782	5,718
Current liabilities:
Accounts payable	203	208
Accrued royalties	1,358	1,263
Accrued liabilities	340	365
Accrued interest	27	41
Deferred revenue	197	197
Current portion of long-term debt	111
Other current liabilities	37	26
Total current liabilities	2,273	2,100
Long-term debt	2,836	2,811
Deferred tax liabilities, net	194	190
Other noncurrent liabilities	274	309
Total liabilities	5,577	5,410
Total Warner Music Group Corp. equity	189	293
Noncontrolling interest	16	15
Total equity	205	308
Total liabilities and equity	5,782	5,718
Reportable Legal Entities \| Guarantor Subsidiaries
Current assets:
Cash and equivalents	329	347	230	180
Accounts receivable, net	230	214
Inventories	14	12
Royalty advances expected to be recouped within one year	98	89
Prepaid and other current assets	12	15
Total current assets	683	677
Due from (to) parent companies	(49)	96
Investments in and advances to consolidated subsidiaries	1,630	1,312
Royalty advances expected to be recouped after one year	120	109
Property, plant and equipment, net	138	139
Goodwill	1,368	1,368
Intangible assets subject to amortization, net	992	1,029
Intangible assets not subject to amortization	71	71
Deferred tax assets, net	44	89
Other assets	50	45
Total assets	5,047	4,935
Current liabilities:
Accounts payable	126	135
Accrued royalties	785	732
Accrued liabilities	155	144
Deferred revenue	146	125
Other current liabilities	5	3
Total current liabilities	1,217	1,139
Other noncurrent liabilities	156	196
Total liabilities	1,373	1,335
Total Warner Music Group Corp. equity	3,669	3,596
Noncontrolling interest	5	4
Total equity	3,674	3,600
Total liabilities and equity	5,047	4,935
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Current assets:
Cash and equivalents	283	300	246	179
Accounts receivable, net	197	190
Inventories	25	27
Royalty advances expected to be recouped within one year	50	52
Prepaid and other current assets	50	29
Total current assets	605	598
Due from (to) parent companies	(469)	(514)
Royalty advances expected to be recouped after one year	61	63
Property, plant and equipment, net	76	74
Goodwill	328	317
Intangible assets subject to amortization, net	1,045	1,061
Intangible assets not subject to amortization	47	46
Deferred tax assets, net	8	8
Other assets	19	17
Total assets	1,720	1,670
Current liabilities:
Accounts payable	76	73
Accrued royalties	573	531
Accrued liabilities	185	221
Deferred revenue	51	72
Other current liabilities	32	23
Total current liabilities	917	920
Deferred tax liabilities, net	194	190
Other noncurrent liabilities	117	112
Total liabilities	1,228	1,222
Total Warner Music Group Corp. equity	481	437
Noncontrolling interest	11	11
Total equity	492	448
Total liabilities and equity	1,720	1,670
Reportable Legal Entities \| Warner Music Group Corp.
Current assets:
Investments in and advances to consolidated subsidiaries	398	377
Total assets	398	377
Current liabilities:
Total Warner Music Group Corp. equity	398	377
Total equity	398	377
Total liabilities and equity	398	377
Reportable Legal Entities \| WMG Acquisition Corp.
Current assets:
Redemption deposit	119
Total current assets	119
Due from (to) parent companies	518	418
Investments in and advances to consolidated subsidiaries	2,520	2,721
Other assets	8	7
Total assets	3,165	3,146
Current liabilities:
Accounts payable	1
Accrued interest	27	41
Current portion of long-term debt	111
Total current liabilities	139	41
Long-term debt	2,836	2,811
Other noncurrent liabilities	1	1
Total liabilities	2,976	2,853
Total Warner Music Group Corp. equity	189	293
Total equity	189	293
Total liabilities and equity	3,165	3,146
Reportable Legal Entities \| WMG Acquisition Corp. Consolidated
Current assets:
Cash and equivalents	612	647	$ 476	$ 359
Redemption deposit	119
Accounts receivable, net	427	404
Inventories	39	39
Royalty advances expected to be recouped within one year	148	141
Prepaid and other current assets	62	44
Total current assets	1,407	1,275
Royalty advances expected to be recouped after one year	181	172
Property, plant and equipment, net	214	213
Goodwill	1,696	1,685
Intangible assets subject to amortization, net	2,037	2,090
Intangible assets not subject to amortization	118	117
Deferred tax assets, net	52	97
Other assets	77	69
Total assets	5,782	5,718
Current liabilities:
Accounts payable	203	208
Accrued royalties	1,358	1,263
Accrued liabilities	340	365
Accrued interest	27	41
Deferred revenue	197	197
Current portion of long-term debt	111
Other current liabilities	37	26
Total current liabilities	2,273	2,100
Long-term debt	2,836	2,811
Deferred tax liabilities, net	194	190
Other noncurrent liabilities	274	309
Total liabilities	5,577	5,410
Total Warner Music Group Corp. equity	189	293
Noncontrolling interest	16	15
Total equity	205	308
Total liabilities and equity	5,782	5,718
Reportable Legal Entities \| WMG Holdings Corp.
Current assets:
Investments in and advances to consolidated subsidiaries	398	377
Total assets	398	377
Current liabilities:
Total Warner Music Group Corp. equity	398	377
Total equity	398	377
Total liabilities and equity	398	377
Eliminations
Current assets:
Investments in and advances to consolidated subsidiaries	(796)	(754)
Total assets	(796)	(754)
Current liabilities:
Total Warner Music Group Corp. equity	(796)	(754)
Total equity	(796)	(754)
Total liabilities and equity	(796)	(754)
Eliminations \| WMG Acquisition Corp.
Current assets:
Investments in and advances to consolidated subsidiaries	(4,150)	(4,033)
Total assets	(4,150)	(4,033)
Current liabilities:
Total Warner Music Group Corp. equity	(4,150)	(4,033)
Total equity	(4,150)	(4,033)
Total liabilities and equity	$ (4,150)	$ (4,033)

Guarantor and Non-Guarantor Subsidiaries Financial Information - Consolidating Statement of Operations Unaudited (Detail) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Mar. 31, 2018

Mar. 31, 2017

$ 963

$ 825

$ 2,008

$ 1,742

(488)

(415)

(1,057)

(911)

^[1]

(337)

(282)

(670)

(558)

(55)

(50)

(108)

(101)

(880)

(747)

(1,835)

(1,570)

173

172

(23)

(24)

(32)

(36)

(72)

(76)

(6)

(19)

(2)

(19)

(3)

(71)

(20)

Less: Income attributable to noncontrolling interest

(1)

(2)

(1)

(3)

Net income (loss) attributable to Warner Music Group Corp.

(3)

Reportable Legal Entities | Guarantor Subsidiaries

Condensed Income Statements Captions [Line Items]

535

470

1,082

960

(242)

(204)

(499)

(424)

(244)

(199)

(479)

(375)

(23)

(26)

(47)

(51)

(509)

(429)

(1,025)

(850)

110

Equity gains (losses) from equity method investments

(1)

143

166

(18)

(4)

(69)

(22)

Less: Income attributable to noncontrolling interest

144

(1)

Net income (loss) attributable to Warner Music Group Corp.

144

Reportable Legal Entities | Non-Guarantor Subsidiaries

Condensed Income Statements Captions [Line Items]

549

439

1,170

960

(327)

(268)

(720)

(609)

(135)

(110)

(273)

(238)

(32)

(24)

(61)

(50)

(494)

(402)

(1,054)

(897)

116

(5)

(16)

(13)

(34)

(9)

(13)

(11)

(9)

(18)

(7)

(28)

(16)

Less: Income attributable to noncontrolling interest

(1)

(2)

(3)

Net income (loss) attributable to Warner Music Group Corp.

Reportable Legal Entities | Warner Music Group Corp.

Equity gains (losses) from equity method investments

(3)

(3)

Net income (loss) attributable to Warner Music Group Corp.

(3)

(3)

Reportable Legal Entities | WMG Acquisition Corp.

(1)

(1)

(1)

(23)

(24)

(32)

Equity gains (losses) from equity method investments

(31)

(21)

(60)

(44)

156

132

(6)

(19)

(3)

(71)

(20)

Net income (loss) attributable to Warner Music Group Corp.

(3)

(3)

Reportable Legal Entities | WMG Acquisition Corp. Consolidated

Condensed Income Statements Captions [Line Items]

963

825

2,008

1,742

(488)

(415)

(1,057)

(911)

(337)

(282)

(670)

(558)

(55)

(50)

(108)

(101)

(880)

(747)

(1,835)

(1,570)

173

172

(23)

(24)

(32)

(36)

(72)

(76)

(6)

(19)

(2)

(19)

(3)

(71)

(20)

Less: Income attributable to noncontrolling interest

(1)

(2)

(1)

(3)

Net income (loss) attributable to Warner Music Group Corp.

(3)

Reportable Legal Entities | WMG Holdings Corp.

Equity gains (losses) from equity method investments

(3)

(3)

Net income (loss) attributable to Warner Music Group Corp.

(3)

(3)

Eliminations

Equity gains (losses) from equity method investments

(38)

(2)

(82)

(38)

(2)

(82)

Net income (loss) attributable to Warner Music Group Corp.

(38)

(2)

(82)

(38)

(2)

(82)

Eliminations | WMG Acquisition Corp.

Condensed Income Statements Captions [Line Items]

(121)

(84)

(244)

(178)

162

122

123

244

178

Equity gains (losses) from equity method investments

(99)

(60)

(232)

(183)

(97)

(60)

(232)

(183)