Guarantor and Non-Guarantor Subsidiaries Financial Information - Consolidating Statement of Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014		Mar. 31, 2013
Condensed Financial Statements Captions [Line Items]
Net (loss) income	$ (59)	$ 4	$ (95)		$ (75)
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	2	(14)	(6)		(12)
Other comprehensive loss, net of tax	2	(14)	(6)	[1]	(12)
Total comprehensive income (loss)	(57)	(10)	(101)		(87)
Less: comprehensive income attributable to noncontrolling interest	(1)	(2)	(2)		(3)
Comprehensive income (loss) attributable to Warner Music Group Corp.	(58)	(12)	(103)		(90)
Eliminations
Condensed Financial Statements Captions [Line Items]
Net (loss) income	30	(37)	62		(62)
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	(2)	14	6		12
Other comprehensive loss, net of tax	(2)	14	6		12
Total comprehensive income (loss)	28	(23)	68		(50)
Less: comprehensive income attributable to noncontrolling interest
Comprehensive income (loss) attributable to Warner Music Group Corp.	28	(23)	68		(50)
Eliminations
Condensed Financial Statements Captions [Line Items]
Net (loss) income	114	(9)	183		145
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	(4)		12
Other comprehensive loss, net of tax	(4)		12
Total comprehensive income (loss)	110	(9)	195		145
Less: comprehensive income attributable to noncontrolling interest
Comprehensive income (loss) attributable to Warner Music Group Corp.	110	(9)	195		145
WMG Acquisition Corp. (issuer)
Condensed Financial Statements Captions [Line Items]
Net (loss) income	(54)	8	(86)		(67)
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	2	(14)	(6)		(12)
Other comprehensive loss, net of tax	2	(14)	(6)		(12)
Total comprehensive income (loss)	(52)	(6)	(92)		(79)
Less: comprehensive income attributable to noncontrolling interest
Comprehensive income (loss) attributable to Warner Music Group Corp.	(52)	(6)	(92)		(79)
Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Net (loss) income	58	8	82		26
Other comprehensive income (loss), net of tax:
Foreign currency adjustment
Other comprehensive loss, net of tax
Total comprehensive income (loss)	58	8	82		26
Less: comprehensive income attributable to noncontrolling interest
Comprehensive income (loss) attributable to Warner Music Group Corp.	58	8	82		26
Non-Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Net (loss) income	(87)	31	(142)		39
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	2	(14)	(6)		(12)
Other comprehensive loss, net of tax	2	(14)	(6)		(12)
Total comprehensive income (loss)	(85)	17	(148)		27
Less: comprehensive income attributable to noncontrolling interest	(1)	(2)	(2)		(3)
Comprehensive income (loss) attributable to Warner Music Group Corp.	(86)	15	(150)		24
WMG Acquisition Corp. Consolidated
Condensed Financial Statements Captions [Line Items]
Net (loss) income	(53)	10	(84)		(64)
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	2	(14)	(6)		(12)
Other comprehensive loss, net of tax	2	(14)	(6)		(12)
Total comprehensive income (loss)	(51)	(4)	(90)		(76)
Less: comprehensive income attributable to noncontrolling interest	(1)	(2)	(2)		(3)
Comprehensive income (loss) attributable to Warner Music Group Corp.	(52)	(6)	(92)		(79)
WMG Holdings Corp. (issuer)
Condensed Financial Statements Captions [Line Items]
Net (loss) income	(60)	1	(97)		(78)
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	2		(6)
Other comprehensive loss, net of tax	2		(6)
Total comprehensive income (loss)	(58)	1	(103)		(78)
Less: comprehensive income attributable to noncontrolling interest
Comprehensive income (loss) attributable to Warner Music Group Corp.	(58)	1	(103)		(78)
Warner Music Group Corp.
Condensed Financial Statements Captions [Line Items]
Net (loss) income	(60)	2	(97)		(78)
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	2		(6)
Other comprehensive loss, net of tax	2		(6)
Total comprehensive income (loss)	(58)	2	(103)		(78)
Less: comprehensive income attributable to noncontrolling interest
Comprehensive income (loss) attributable to Warner Music Group Corp.	$ (58)	$ 2	$ (103)		$ (78)

[1] Foreign currency translation adjustments include a gain on intra-entity foreign currency transactions that are of a long-term investment nature of $2 million.