Consolidated Statement of (Deficit) Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total Warner Music Group Corp. (Deficit) Equity	Noncontrolling Interest
Beginning balance at Sep. 30, 2017	$ 308		$ 1,128	$ (654)	$ (181)	$ 293	$ 15
Beginning balance, shares at Sep. 30, 2017		1,055
Net income (loss)	4			1		1	3
Other comprehensive (loss) income, net of tax	20				20	20
Dividends	(125)			(125)		(125)
Distribution to noncontrolling interest holders	(2)						(2)
Other, shares		(3)
Ending balance at Mar. 31, 2018	205		1,128	(778)	(161)	189	16
Ending balance, shares at Mar. 31, 2018		1,052
Beginning balance at Dec. 31, 2017	321		1,128	(650)	(171)	307	14
Beginning balance, shares at Dec. 31, 2017		1,055
Net income (loss)	(1)			(3)		(3)	2
Other comprehensive (loss) income, net of tax	10				10	10
Dividends	(125)			(125)		(125)
Other, shares		(3)
Ending balance at Mar. 31, 2018	205		1,128	(778)	(161)	189	16
Ending balance, shares at Mar. 31, 2018		1,052
Beginning balance at Sep. 30, 2018	$ (320)		1,128	(1,272)	(190)	(334)	14
Beginning balance, shares at Sep. 30, 2018	1,052	1,052
Cumulative effect of ASC 606 adoption	$ 150			139		139	11
Net income (loss)	153			153		153
Other comprehensive (loss) income, net of tax	(35)				(35)	(35)
Dividends	(63)			(63)		(63)
Distribution to noncontrolling interest holders	(2)						(2)
Other	(3)						(3)
Other, shares		8
Ending balance at Mar. 31, 2019	$ (120)		1,128	(1,043)	(225)	(140)	20
Ending balance, shares at Mar. 31, 2019	1,052	1,060
Beginning balance at Dec. 31, 2018	$ (139)		1,128	(1,078)	(212)	(162)	23
Beginning balance, shares at Dec. 31, 2018		1,060
Net income (loss)	67			67		67
Other comprehensive (loss) income, net of tax	(13)				(13)	(13)
Dividends	(32)			(32)		(32)
Other	(3)						(3)
Ending balance at Mar. 31, 2019	$ (120)		$ 1,128	$ (1,043)	$ (225)	$ (140)	$ 20
Ending balance, shares at Mar. 31, 2019	1,052	1,060