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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (470)	$ 258	$ 312
Other comprehensive (loss) income, net of tax
Foreign currency adjustment	37	(34)	(13)
Deferred (loss) gain on derivative financial instruments	(21)	(11)	3
Minimum pension liability	2	(5)	1
Other comprehensive income (loss), net of tax	18	(50)	(9)
Total comprehensive (loss) income	(452)	208	303
Less: Income attributable to noncontrolling interest	(5)	(2)	(5)
Comprehensive (loss) income attributable to Warner Music Group Corp.	$ (457)	$ 206	$ 298

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