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Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Loans And Leases Receivable [Line Items]    
Amount of foreclosed residential real estate property held $ 23 $ 28
Loans secured by residential real estate that were in the process of foreclosure $ 188 214
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed 39.00%  
Minimum [Member]    
Loans And Leases Receivable [Line Items]    
Loan delinquent period 90 days  
Minimum [Member] | Commercial Loans and Commercial Real Estate [Member]    
Loans And Leases Receivable [Line Items]    
Amount of real estate loan as reported as accruing or nonaccruing $ 1  
Maximum [Member]    
Loans And Leases Receivable [Line Items]    
Loan delinquent period 150 days  
Residential Mortgage Loans [Member] | One-to-Four Family Residential [Member]    
Loans And Leases Receivable [Line Items]    
Mortgage loans held for sale $ 679 777
Commercial Real Estate Loans [Member] | One-to-Four Family Residential [Member]    
Loans And Leases Receivable [Line Items]    
Mortgage loans held for sale $ 206 $ 278