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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 307	$ (470)	$ 258
Other comprehensive (loss) income, net of tax
Foreign currency adjustment	7	37	(34)
Deferred gain (loss) on derivative financial instruments	12	(21)	(11)
Minimum pension liability	1	2	(5)
Other comprehensive income (loss), net of tax	20	18	(50)
Total comprehensive income (loss)	327	(452)	208
Less: Income attributable to noncontrolling interest	(3)	(5)	(2)
Comprehensive income (loss) attributable to Warner Music Group Corp.	$ 324	$ (457)	$ 206

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