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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total gross intangible asset subject to amortization $ 3,917 $ 3,500
Accumulated amortization (1,990) (1,847)
Total net intangible assets subject to amortization 1,927 1,653
Intangible assets not subject to amortization:    
Trademarks and tradenames 154 154
Total net intangible assets 2,081 1,807
Trademarks and tradenames    
Intangible assets not subject to amortization:    
Trademarks and tradenames $ 154 154
Recorded music catalog    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 11 years  
Total gross intangible asset subject to amortization $ 1,026 876
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 $ 1,707 1,597
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 $ 990 862
Trademarks    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 15 years  
Total gross intangible asset subject to amortization $ 94 81
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 $ 100 $ 84