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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Mar. 31, 2023
Sep. 30, 2022
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset $ 10  
Foreign exchange derivative contracts in liability 14  
Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset 2  
Foreign exchange derivative contracts in liability 6  
Other current assets    
Derivatives, Fair Value [Line Items]    
Other assets 13 $ 2
Other current assets | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset 11 2
Other current assets | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Other assets 2  
Other current liabilities    
Derivatives, Fair Value [Line Items]    
Other liabilities (6) 0
Other current liabilities | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Other liabilities (6)  
Other noncurrent assets    
Derivatives, Fair Value [Line Items]    
Other assets $ 0 16
Other noncurrent assets | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset   $ 16