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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total gross intangible asset subject to amortization $ 3,500 $ 3,347
Accumulated amortization (1,847) (1,624)
Total net intangible assets subject to amortization 1,653 1,723
Intangible assets not subject to amortization 154 151
Total net intangible assets 1,807 1,874
Trademarks and tradenames    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets not subject to amortization $ 154 151
Recorded music catalog    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 10 years  
Total gross intangible asset subject to amortization $ 876 855
Music publishing copyrights    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 26 years  
Total gross intangible asset subject to amortization $ 1,597 1,539
Artist and songwriter contracts    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 13 years  
Total gross intangible asset subject to amortization $ 862 841
Trademarks    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 16 years  
Total gross intangible asset subject to amortization $ 81 53
Other intangible assets    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 6 years  
Total gross intangible asset subject to amortization $ 84 $ 59