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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets Footnote (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Sep. 30, 2020
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset $ 4  
Foreign exchange derivative contracts in liability 4  
Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in liability $ 26 $ 38