Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Sep. 30, 2021
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Total gross intangible asset subject to amortization	$ 4,613	$ 4,125
Accumulated amortization	(2,141)	(2,108)
Total net intangible assets subject to amortization	2,472	2,017
Intangible assets not subject to amortization:
Trademarks and tradenames	152	154
Total net intangible assets	2,624	2,171
Trademarks and tradenames
Intangible assets not subject to amortization:
Trademarks and tradenames	$ 152	154
Recorded music catalog
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	12 years
Total gross intangible asset subject to amortization	$ 1,338	1,206
Music publishing copyrights
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	25 years
Total gross intangible asset subject to amortization	$ 2,005	1,730
Artist and songwriter contracts
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	13 years
Total gross intangible asset subject to amortization	$ 1,068	997
Trademarks
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	14 years
Total gross intangible asset subject to amortization	$ 106	96
Other intangible assets
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Useful Life	6 years
Total gross intangible asset subject to amortization	$ 96	$ 96