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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total gross intangible assets subject to amortization $ 5,743 $ 5,106
Accumulated amortization (2,979) (2,747)
Total net intangible assets subject to amortization 2,764 2,359
Intangible assets not subject to amortization:    
Trademarks and tradenames 154 152
Total net intangible assets 2,918 2,511
Trademarks and tradenames    
Intangible assets not subject to amortization:    
Trademarks and tradenames $ 154 152
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 $ 1,780 1,616
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 $ 2,677 2,227
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 $ 1,143 1,125
Trademarks    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 16 years  
Total gross intangible assets subject to amortization $ 55 69
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 $ 88 $ 69