v3.26.1
Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value   $ 8
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Other assets
(Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value   $ 8
(Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value   0
(Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value   0
Foreign currency forward exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current assets $ 5  
Other current liabilities (1) (3)
Foreign currency forward exchange contracts | (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current assets 0  
Other current liabilities 0 0
Foreign currency forward exchange contracts | (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current assets 5  
Other current liabilities (1) (3)
Foreign currency forward exchange contracts | (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current assets 0  
Other current liabilities 0 0
Interest rate cap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current assets 1 $ 0
Equity investment with readily determinable fair value 1  
Interest rate cap | (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 0  
Interest rate cap | (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 1  
Interest rate cap | (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 0  
Equity investments with readily determinable fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 7  
Equity investments with readily determinable fair value | (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 7  
Equity investments with readily determinable fair value | (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 0  
Equity investments with readily determinable fair value | (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value $ 0