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Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 25, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Business Acquisition [Line Items]        
Goodwill   $ 2,021 $ 1,993 $ 1,920
TenThousand Projects        
Business Acquisition [Line Items]        
Percentage of voting interests acquired (as a percent) 51.00%      
Purchase price of selected assets $ 110      
Final purchase price 102      
Base price payable   11    
Fair value of net assets acquired 19      
Intangible assets 152      
Noncontrolling interest, fair value 105      
Goodwill 44      
Decrease to intangible assets   1    
Goodwill, purchase accounting adjustments   1    
Decrease in other liabilities   1    
Net increase in fair value of noncontrolling interest   1    
Business acquisition, transaction costs   $ 3    
TenThousand Projects | Recorded music catalog        
Business Acquisition [Line Items]        
Intangible assets 99      
TenThousand Projects | Artist and songwriter contracts        
Business Acquisition [Line Items]        
Intangible assets 48      
TenThousand Projects | Trademarks [Member]        
Business Acquisition [Line Items]        
Intangible assets $ 5