Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 241	$ 193
Other comprehensive (loss) income, net of tax:
Foreign currency adjustment	(129)	64
Deferred (loss) gain on derivative financial instruments	0	(1)
Minimum pension liability	0	(1)
Other comprehensive (loss) income, net of tax	(129)	62
Total comprehensive income	112	255
Less: Income attributable to noncontrolling interest	(5)	(34)
Comprehensive income attributable to Warner Music Group Corp.	$ 107	$ 221

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