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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Sep. 30, 2023
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total gross intangible assets subject to amortization $ 4,983 $ 4,839
Accumulated amortization (2,593) (2,486)
Total net intangible assets subject to amortization 2,390 2,353
Intangible assets not subject to amortization:    
Trademarks and tradenames 151 149
Total net intangible assets 2,541 2,502
Trademarks and tradenames    
Intangible assets not subject to amortization:    
Trademarks and tradenames $ 151 149
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 $ 1,540 1,507
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 $ 2,111 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 $ 1,113 1,091
Trademarks    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 14 years  
Total gross intangible assets subject to amortization $ 113 111
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 $ 106 $ 104