Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue		$ 1,071	$ 1,090	$ 2,327	$ 2,293
Costs and expenses:
Cost of revenue		(535)	(559)	(1,200)	(1,185)
Selling, general and administrative expenses	[1]	(538)	(354)	(917)	(730)
Amortization expense		(47)	(55)	(94)	(109)
Total costs and expenses		(1,120)	(968)	(2,211)	(2,024)
Operating (loss) income		(49)	122	116	269
Loss on extinguishment of debt		0	0	0	(3)
Interest expense, net		(33)	(36)	(66)	(72)
Other (expense) income		(4)	29	(9)	57
(Loss) income before income taxes		(86)	115	41	251
Income tax benefit (expense)		12	(48)	7	(98)
Net (loss) income		(74)	67	48	153
Less: Income attributable to noncontrolling interest		0	0	(2)	0
Net (loss) income attributable to Warner Music Group Corp.		$ (74)	$ 67	$ 46	$ 153
Net (loss) income per share attributable to Warner Music Group Corp.’s stockholders:
Basic and Diluted (in dollars per share)		$ (0.15)	$ 0.13	$ 0.09	$ 0.30
Weighted average common shares:
Basic and Diluted (in shares)		501,991,944	501,991,944	501,991,944	501,991,944

[1] Includes depreciation expense of $(14) and $(14) for the three months ended March 31, 2020 and March 31, 2019, respectively, and $(38) and $(28) for the six months ended March 31, 2020 and March 31, 2019, respectively.