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Derivative Instruments and Hedging Activities - Effect of Derivative Financial Instruments on Income Statement (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest rate swaps | Non-interest income - other      
Derivative [Line Items]      
Derivative financial instrument, net $ 0 $ 0 $ 0
Interest rate lock commitments | Mortgage banking operations      
Derivative [Line Items]      
Derivative financial instrument, net 0 0 0
Forward delivery contracts | Mortgage banking operations      
Derivative [Line Items]      
Derivative financial instrument, net 2 (2) (1)
Credit risk contracts | Non-interest income - other      
Derivative [Line Items]      
Derivative financial instrument, net $ 0 $ 0 $ 0