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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total gross intangible asset subject to amortization $ 4,596 $ 4,125
Accumulated amortization (2,185) (2,108)
Total net intangible assets subject to amortization 2,411 2,017
Intangible assets not subject to amortization:    
Trademarks and tradenames 152 154
Total net intangible assets 2,563 2,171
Trademarks and tradenames    
Intangible assets not subject to amortization:    
Trademarks and tradenames $ 152 154
Recorded music catalog    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 12 years  
Total gross intangible asset subject to amortization $ 1,344 1,206
Music publishing copyrights    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 25 years  
Total gross intangible asset subject to amortization $ 1,988 1,730
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 $ 1,064 997
Trademarks    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted-Average Useful Life 15 years  
Total gross intangible asset subject to amortization $ 105 96
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 $ 95 $ 96