Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 188	$ 99
Other comprehensive (loss) income, net of tax:
Foreign currency adjustment	(25)	34
Deferred gain on derivative financial instruments	7	3
Other comprehensive (loss) income, net of tax	(18)	37
Total comprehensive income	170	136
Less: Income attributable to noncontrolling interest	(1)	(1)
Comprehensive income attributable to Warner Music Group Corp.	$ 169	$ 135