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Mortgage Servicing Rights - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Transfers and Servicing of Financial Assets [Abstract]      
Residential mortgage loans serviced for others including subserviced mortgages with no corresponding MSRs asset $ 222,400 $ 211,800  
Gain (Loss) on fair value changes of MSRs due to changes in valuation assumptions and derivatives used to economically hedge MSRs (183) 18 $ (24)
Loan servicing and ancillary fees $ 725 $ 718 $ 734