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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Accounting Policies [Line Items]      
Total assets $ 9,829 $ 9,155  
Total liabilities 9,072 8,480  
Foreign currency transaction gain (loss) recognized (5) 2 $ 4
Foreign currency transaction gain (loss) recognized in other income (expense) (75) (72) (37)
Advertising expense $ 113 $ 119 $ 136
Award requisite service period 4 years    
Performance Shares Units (PSUs)      
Accounting Policies [Line Items]      
Award requisite service period 3 years    
Stock Option      
Accounting Policies [Line Items]      
Award requisite service period 4 years    
Furniture and fixtures | Minimum      
Accounting Policies [Line Items]      
Property plant and equipment useful life 5 years    
Furniture and fixtures | Maximum      
Accounting Policies [Line Items]      
Property plant and equipment useful life 7 years    
Computer Equipment | Maximum      
Accounting Policies [Line Items]      
Property plant and equipment useful life 5 years    
Machinery and equipment | Maximum      
Accounting Policies [Line Items]      
Property plant and equipment useful life 13 years    
Building | Maximum      
Accounting Policies [Line Items]      
Property plant and equipment useful life 40 years    
Spotify | Accounts Receivable | Credit Concentration Risk      
Accounting Policies [Line Items]      
Customer concentration percentage (as a percent) 20.00% 18.00%  
Variable Interest Entity, Primary Beneficiary      
Accounting Policies [Line Items]      
Total assets $ 65 $ 77  
Total liabilities $ 2 $ 2