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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets Footnote (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset $ 5  
Foreign exchange derivative contracts in liability 8  
Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Foreign exchange derivative contracts in asset 4 $ 2
Foreign exchange derivative contracts in liability $ 11 $ 13