Consolidated Statement of Equity (USD $) In Millions, except Share data		Total USD ($)	Predecessor [Member] USD ($)	Successor [Member] USD ($)	Common Stock [Member] Predecessor [Member]	Common Stock [Member] Successor [Member]	Additional Paid-in Capital [Member] Predecessor [Member] USD ($)	Additional Paid-in Capital [Member] Successor [Member] USD ($)	Accumulated Deficit [Member] Predecessor [Member] USD ($)	Accumulated Deficit [Member] Successor [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] Predecessor [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] Successor [Member] USD ($)	Total Warner Music Group Corp. Equity [Member] Predecessor [Member] USD ($)	Total Warner Music Group Corp. Equity [Member] Successor [Member] USD ($)	Noncontrolling Interests [Member] Predecessor [Member] USD ($)	Noncontrolling Interests [Member] Successor [Member] USD ($)
Beginning balance at Sep. 30, 2010			$ (211)				$ 611		$ (929)		$ 53		$ (265)		$ 54
Beginning balance, shares at Sep. 30, 2010					154,950,776
Beginning balance, per share value at Sep. 30, 2010					0.001
Net loss			(175)						(174)				(174)		(1)
Other comprehensive (loss) income, net of tax			11								11		11
Distribution to noncontrolling interest			(4)												(4)
Share-based compensation			24				24						24
Stock based compensation, shares					(7,731,089)
Initial investment by Parent, per share value					0.001
Exercises of stock options			6				6						6
Exercises of stock options, shares					1,688,541
Ending balance at Jul. 19, 2011			(349)				641		(1,103)		64		(398)		49
Ending balance, shares at Jul. 19, 2011					148,908,228
Ending balance, per share value at Jul. 19, 2011					0.001
Initial investment by Parent				1,129				1,129						1,129
Initial investment by Parent, shares						1,000
Net loss				(31)						(31)				(31)
Other comprehensive (loss) income, net of tax				(33)								(33)		(33)
Distribution to noncontrolling interest				17												17
Initial investment by Parent, per share value						0.001
Ending balance at Sep. 30, 2011				1,082				1,129		(31)		(33)		1,065		17
Ending balance, shares at Sep. 30, 2011						1,000
Ending balance, per share value at Sep. 30, 2011						0.001
Net loss	[1]			(26)
Ending balance at Dec. 31, 2011
Beginning balance at Sep. 30, 2011				1,082						(31)		(33)		1,065		17
Net loss				(109)						(112)				(112)		3
Other comprehensive (loss) income, net of tax				(26)								(26)		(26)
Distribution to noncontrolling interest				(3)												(3)
Initial investment by Parent, per share value				$ 0.001
Ending balance at Sep. 30, 2012		944		944						(143)		(59)		927		17
Ending balance, shares at Sep. 30, 2012				1,000
Ending balance, per share value at Sep. 30, 2012				$ 0.001
Beginning balance at Jun. 30, 2012
Net loss	[1]			(17)
Initial investment by Parent, per share value				$ 0.001
Ending balance at Sep. 30, 2012		944		944
Ending balance, shares at Sep. 30, 2012				1,000
Ending balance, per share value at Sep. 30, 2012				$ 0.001
Net loss	[1]			(79)
Ending balance at Dec. 31, 2012
Beginning balance at Sep. 30, 2012		944		944				1,129		(143)		(59)		927		17
Beginning balance, shares at Sep. 30, 2012				1,000		1,000
Beginning balance, per share value at Sep. 30, 2012				$ 0.001		0.001
Net loss				(194)						(198)				(198)		4
Other comprehensive (loss) income, net of tax				(2)								(2)		(2)
Distribution to noncontrolling interest				(4)												(4)
Deconsolidation of entity				(1)				(1)						(1)
Stock dividend, Shares						55
Initial investment by Parent, per share value				$ 0.001		0.001
Ending balance at Sep. 30, 2013		743		743				1,128		(341)		(61)		726		17
Ending balance, shares at Sep. 30, 2013				1,055		1,055
Ending balance, per share value at Sep. 30, 2013				$ 0.001		0.001
Beginning balance at Jun. 30, 2013
Net loss	[1]			(57)
Initial investment by Parent, per share value				$ 0.001
Ending balance at Sep. 30, 2013		$ 743		$ 743
Ending balance, shares at Sep. 30, 2013				1,055
Ending balance, per share value at Sep. 30, 2013				$ 0.001

[1] The Company's business is seasonal. Therefore, quarterly operating results are not necessarily indicative of the results that may be expected for the full fiscal year.