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Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value $ 10 $ 15
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 10 15
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value 0 0
Other noncurrent liabilities:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contractual obligations (1) (1)
Other noncurrent liabilities: | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contractual obligations 0 0
Other noncurrent liabilities: | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contractual obligations 0 0
Other noncurrent liabilities: | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contractual obligations (1) $ (1)
Other Noncurrent Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Other assets
Foreign Exchange Contract | Other Current Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Forward Exchange Contracts 1  
Foreign Exchange Contract | Other Current Assets | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Forward Exchange Contracts 0  
Foreign Exchange Contract | Other Current Assets | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Forward Exchange Contracts 1  
Foreign Exchange Contract | Other Current Assets | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Forward Exchange Contracts 0  
Interest rate swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Forward Exchange Contracts $ 0 $ 2
Equity investment with readily determinable fair value   2
Interest rate swap | 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 swap | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value   2
Interest rate swap | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investment with readily determinable fair value   $ 0
Interest rate swap | Other Current Assets | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid and other current assets Prepaid and other current assets