Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenue		$ 1,045	$ 917
Costs and expenses:
Cost of revenue		(569)	(496)
Selling, general and administrative expenses	[1]	(333)	(276)
Amortization expense		(53)	(51)
Total costs and expenses		(955)	(823)
Operating income		90	94
Loss on extinguishment of debt		(1)	(32)
Interest expense, net		(36)	(40)
Other income		4	19
Income before income taxes		57	41
Income tax expense		(52)	(17)
Net income		5	24
Less: Income attributable to noncontrolling interest		(1)	(2)
Net income attributable to Warner Music Group Corp.		$ 4	$ 22

[1] (a) Includes depreciation expense of: $(12) $(12)