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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total gross intangible assets subject to amortization $ 4,633 $ 4,411
Accumulated amortization (2,401) (2,172)
Total net intangible assets subject to amortization 2,232 2,239
Intangible assets not subject to amortization:    
Trademarks and tradenames 150 145
Total net intangible assets 2,382 2,384
Trademarks and tradenames    
Intangible assets not subject to amortization:    
Trademarks and tradenames $ 150 145
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 $ 1,391 1,316
Music publishing copyrights    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 25 years  
Total gross intangible assets subject to amortization $ 1,982 1,889
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 $ 1,055 1,014
Trademarks    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 15 years  
Total gross intangible assets subject to amortization $ 108 103
Other intangible assets    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 6 years  
Total gross intangible assets subject to amortization $ 97 $ 89