Consolidated Statement of Equity (USD $) In Millions, except Share data	Total USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member] USD ($)	Accumulated Deficit [Member] USD ($)	Accumulated Other Comprehensive Loss [Member] USD ($)	Total Warner Music Group Corp. Equity [Member] USD ($)	Noncontrolling Interests [Member] USD ($)
Beginning balance at Sep. 30, 2012	$ 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) income	(75)			(78)		(78)	3
Deconsolidation of entity	(1)		(1)			(1)
Other comprehensive loss	(12)				(12)	(12)
Distribution to noncontrolling interests	(1)						(1)
Stock dividend, shares		55
Ending balance at Mar. 31, 2013	$ 855		$ 1,128	$ (221)	$ (71)	$ 836	$ 19
Ending balance, shares at Mar. 31, 2013	1,055	1,055
Ending balance, per share value at Mar. 31, 2013	$ 0.001	0.001