Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 14	$ 321	$ 167	$ 325
Other comprehensive income (loss), net of tax:
Foreign currency adjustment	9	(31)	(17)	(13)
Deferred loss on derivative	(3)	(3)	(12)	(1)
Other comprehensive income (loss), net of tax	6	(34)	(29)	(14)
Total comprehensive income	20	287	138	311
Less: Income attributable to noncontrolling interest	(1)	(1)	(1)	(4)
Comprehensive income attributable to Warner Music Group Corp.	$ 19	$ 286	$ 137	$ 307