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Derivatives - Additional Information (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative notional amount $ 720  
Derivative liability $ 39  
Derivative asset   $ 1
Derivative, fixed interest rate 1.62%  
London Interbank Offered Rate (LIBOR) [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative variable interest Rate 0.15% 1.76%