Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue		$ 1,090	$ 963	$ 2,293	$ 2,008
Costs and expenses:
Cost of revenue		(559)	(488)	(1,185)	(1,057)
Selling, general and administrative expenses	[1]	(354)	(337)	(730)	(670)
Amortization expense		(55)	(55)	(109)	(108)
Total costs and expenses		(968)	(880)	(2,024)	(1,835)
Operating income		122	83	269	173
Loss on extinguishment of debt			(23)	(3)	(24)
Interest expense, net		(36)	(36)	(72)	(72)
Other income (expense), net		29	(6)	57	(2)
Income before income taxes		115	18	251	75
Income tax expense		(48)	(19)	(98)	(71)
Net income (loss)		67	(1)	153	4
Less: Income attributable to noncontrolling interest			(2)		(3)
Net income (loss) attributable to Warner Music Group Corp.		$ 67	$ (3)	$ 153	$ 1

[1] (a) Includes depreciation expense of: