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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total gross intangible assets subject to amortization $ 4,125 $ 3,500
Accumulated amortization (2,108) (1,847)
Total net intangible assets subject to amortization 2,017 1,653
Intangible assets not subject to amortization 154 154
Total net intangible assets 2,171 1,807
Trademarks and tradenames    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets not subject to amortization $ 154 154
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 $ 1,206 876
Music publishing copyrights    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 26 years  
Total gross intangible assets subject to amortization $ 1,730 1,597
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 $ 997 862
Trademarks    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 15 years  
Total gross intangible assets subject to amortization $ 96 81
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 $ 96 $ 84