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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 117	$ (74)	$ 216	$ 48
Other comprehensive (loss) income, net of tax:
Foreign currency adjustment	(27)	(15)	7	(8)
Deferred gain (loss) on derivative financial instruments	3	(23)	6	(20)
Other comprehensive (loss) income, net of tax	(24)	(38)	13	(28)
Total comprehensive income (loss)	93	(112)	229	20
Less: Income attributable to noncontrolling interest	0	0	(1)	(2)
Comprehensive income (loss) attributable to Warner Music Group Corp.	$ 93	$ (112)	$ 228	$ 18

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