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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total gross intangible assets subject to amortization $ 4,936 $ 4,839
Accumulated amortization (2,627) (2,486)
Total net intangible assets subject to amortization 2,309 2,353
Intangible assets not subject to amortization:    
Trademarks and tradenames 150 149
Total net intangible assets 2,459 2,502
Trademarks and tradenames    
Intangible assets not subject to amortization:    
Trademarks and tradenames $ 150 149
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 $ 1,549 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 $ 2,150 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 $ 1,103 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 $ 67 111
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 $ 67 $ 104