Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Total gross intangible assets subject to amortization	$ 5,106	$ 4,839
Accumulated amortization	(2,747)	(2,486)
Total net intangible assets subject to amortization	2,359	2,353
Intangible assets not subject to amortization:
Trademarks and tradenames	152	149
Total net intangible assets	2,511	2,502
Trademarks and tradenames
Intangible assets not subject to amortization:
Trademarks and tradenames	$ 152	149
Recorded music catalog
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	12 years
Total gross intangible assets subject to amortization	$ 1,616	1,507
Music publishing copyrights
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	24 years
Total gross intangible assets subject to amortization	$ 2,227	2,026
Artist and songwriter contracts
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	13 years
Total gross intangible assets subject to amortization	$ 1,125	1,091
Trademarks
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	18 years
Total gross intangible assets subject to amortization	$ 69	111
Other intangible assets
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	7 years
Total gross intangible assets subject to amortization	$ 69	$ 104