Guarantor and Non-Guarantor Subsidiaries Financial Information - Consolidating Statements of Operations (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]
Revenues	$ 653		$ 675		$ 1,468		$ 1,444
Costs and expenses:
Cost of revenues	(319)		(327)		(760)		(734)
Selling, general and administrative expenses	(273)	[1]	(244)	[1]	(566)	[1]	(507)	[1]
Amortization of intangible assets	(66)		(47)		(132)		(95)
Total costs and expenses	(658)		(618)		(1,458)		(1,336)
Operating income (expense)	(5)		57		10		108
Loss on extinguishment of debt							(83)
Interest expense, net	(54)		(49)		(109)		(102)
Equity gains (losses) from consolidated subsidiaries
Other expense, net	(3)		(4)		(7)		(9)
Income (loss) before income taxes	(62)		4		(106)		(86)
Income tax benefit	3				11		11
Net (loss) income	(59)		4		(95)		(75)
Less: income attributable to noncontrolling interest	(1)		(2)		(2)		(3)
Net income (loss) attributable to Warner Music Group Corp.	(60)		2		(97)		(78)
Eliminations
Condensed Financial Statements Captions [Line Items]
Revenues	(28)		(49)		(77)		(105)
Costs and expenses:
Cost of revenues	25		44		74		93
Selling, general and administrative expenses	2		(3)		3		12
Amortization of intangible assets
Total costs and expenses	27		41		77		105
Operating income (expense)	(1)		(8)
Loss on extinguishment of debt
Interest expense, net
Equity gains (losses) from consolidated subsidiaries	30		(28)		64		(52)
Other expense, net
Income (loss) before income taxes	29		(36)		64		(52)
Income tax benefit	1		(1)		(2)		(10)
Net (loss) income	30		(37)		62		(62)
Less: income attributable to noncontrolling interest
Net income (loss) attributable to Warner Music Group Corp.	30		(37)		62		(62)
Eliminations
Condensed Financial Statements Captions [Line Items]
Revenues
Costs and expenses:
Cost of revenues
Selling, general and administrative expenses
Amortization of intangible assets
Total costs and expenses
Operating income (expense)
Loss on extinguishment of debt
Interest expense, net
Equity gains (losses) from consolidated subsidiaries	114		(9)		183		145
Other expense, net
Income (loss) before income taxes	114		(9)		183		145
Income tax benefit
Net (loss) income	114		(9)		183		145
Less: income attributable to noncontrolling interest
Net income (loss) attributable to Warner Music Group Corp.	114		(9)		183		145
WMG Acquisition Corp. (issuer)
Condensed Financial Statements Captions [Line Items]
Revenues
Costs and expenses:
Cost of revenues
Selling, general and administrative expenses
Amortization of intangible assets
Total costs and expenses
Operating income (expense)
Loss on extinguishment of debt							(83)
Interest expense, net	(28)		(41)		(59)		(85)
Equity gains (losses) from consolidated subsidiaries	(32)		56		(53)		97
Other expense, net	3		(7)		15		(7)
Income (loss) before income taxes	(57)		8		(97)		(78)
Income tax benefit	3				11		11
Net (loss) income	(54)		8		(86)		(67)
Less: income attributable to noncontrolling interest
Net income (loss) attributable to Warner Music Group Corp.	(54)		8		(86)		(67)
Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Revenues	349		351		703		695
Costs and expenses:
Cost of revenues	(136)		(166)		(291)		(327)
Selling, general and administrative expenses	(119)		(128)		(234)		(252)
Amortization of intangible assets	(30)		(28)		(60)		(58)
Total costs and expenses	(285)		(322)		(585)		(637)
Operating income (expense)	64		29		118		58
Loss on extinguishment of debt
Interest expense, net	3		2		4		3
Equity gains (losses) from consolidated subsidiaries	2		(28)		(11)		(45)
Other expense, net	(7)		5		(21)
Income (loss) before income taxes	62		8		90		16
Income tax benefit	(4)				(8)		10
Net (loss) income	58		8		82		26
Less: income attributable to noncontrolling interest
Net income (loss) attributable to Warner Music Group Corp.	58		8		82		26
Non-Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Revenues	332		373		842		854
Costs and expenses:
Cost of revenues	(208)		(205)		(543)		(500)
Selling, general and administrative expenses	(156)		(113)		(335)		(267)
Amortization of intangible assets	(36)		(19)		(72)		(37)
Total costs and expenses	(400)		(337)		(950)		(804)
Operating income (expense)	(68)		36		(108)		50
Loss on extinguishment of debt
Interest expense, net	(23)		(4)		(43)		(9)
Equity gains (losses) from consolidated subsidiaries
Other expense, net	1		(2)		(1)		(2)
Income (loss) before income taxes	(90)		30		(152)		39
Income tax benefit	3		1		10
Net (loss) income	(87)		31		(142)		39
Less: income attributable to noncontrolling interest	(1)		(2)		(2)		(3)
Net income (loss) attributable to Warner Music Group Corp.	(88)		29		(144)		36
WMG Acquisition Corp. Consolidated
Condensed Financial Statements Captions [Line Items]
Revenues	653		675		1,468		1,444
Costs and expenses:
Cost of revenues	(319)		(327)		(760)		(734)
Selling, general and administrative expenses	(273)		(244)		(566)		(507)
Amortization of intangible assets	(66)		(47)		(132)		(95)
Total costs and expenses	(658)		(618)		(1,458)		(1,336)
Operating income (expense)	(5)		57		10		108
Loss on extinguishment of debt							(83)
Interest expense, net	(48)		(43)		(98)		(91)
Equity gains (losses) from consolidated subsidiaries
Other expense, net	(3)		(4)		(7)		(9)
Income (loss) before income taxes	(56)		10		(95)		(75)
Income tax benefit	3				11		11
Net (loss) income	(53)		10		(84)		(64)
Less: income attributable to noncontrolling interest	(1)		(2)		(2)		(3)
Net income (loss) attributable to Warner Music Group Corp.	(54)		8		(86)		(67)
WMG Holdings Corp. (issuer)
Condensed Financial Statements Captions [Line Items]
Revenues
Costs and expenses:
Cost of revenues
Selling, general and administrative expenses
Amortization of intangible assets
Total costs and expenses
Operating income (expense)
Loss on extinguishment of debt
Interest expense, net	(6)		(6)		(11)		(11)
Equity gains (losses) from consolidated subsidiaries	(54)		7		(86)		(67)
Other expense, net
Income (loss) before income taxes	(60)		1		(97)		(78)
Income tax benefit
Net (loss) income	(60)		1		(97)		(78)
Less: income attributable to noncontrolling interest
Net income (loss) attributable to Warner Music Group Corp.	(60)		1		(97)		(78)
Warner Music Group Corp.
Condensed Financial Statements Captions [Line Items]
Revenues
Costs and expenses:
Cost of revenues
Selling, general and administrative expenses
Amortization of intangible assets
Total costs and expenses
Operating income (expense)
Loss on extinguishment of debt
Interest expense, net
Equity gains (losses) from consolidated subsidiaries	(60)		2		(97)		(78)
Other expense, net
Income (loss) before income taxes	(60)		2		(97)		(78)
Income tax benefit
Net (loss) income	(60)		2		(97)		(78)
Less: income attributable to noncontrolling interest
Net income (loss) attributable to Warner Music Group Corp.	$ (60)		$ 2		$ (97)		$ (78)

[1] (a) Includes depreciation expense of:$(13)$(12)$(25)$(25)