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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset $ 12  
Foreign exchange derivative contracts in liability 10  
Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset 8  
Foreign exchange derivative contracts in liability 2 $ 22
Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset 3  
Foreign exchange derivative contracts in liability 1  
Other current assets    
Derivatives, Fair Value [Line Items]    
Other assets 3 0
Other current liabilities    
Derivatives, Fair Value [Line Items]    
Other liabilities (3) 0
Other current liabilities | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Other liabilities (1)  
Other noncurrent assets    
Derivatives, Fair Value [Line Items]    
Other assets 8 0
Other noncurrent liabilities    
Derivatives, Fair Value [Line Items]    
Other liabilities $ 0 $ (22)