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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset $ 13  
Foreign exchange derivative contracts in liability 10  
Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in liability   $ 22
Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset 3  
Other current assets    
Derivatives, Fair Value [Line Items]    
Other assets 4 0
Other current assets | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset 1  
Other current assets | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Other assets 3  
Other current liabilities    
Derivatives, Fair Value [Line Items]    
Other liabilities 0 0
Other noncurrent assets    
Derivatives, Fair Value [Line Items]    
Other assets 11 0
Other noncurrent assets | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset 11  
Other noncurrent liabilities    
Derivatives, Fair Value [Line Items]    
Other liabilities $ 0 $ (22)