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Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Loans And Leases Receivable [Line Items]    
Amount of foreclosed residential real estate property held $ 45 $ 41
Loans secured by residential real estate that were in the process of foreclosure $ 194 201
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed 44.00%  
Minimum [Member]    
Loans And Leases Receivable [Line Items]    
Loan delinquent period 90 days  
Maximum [Member]    
Loans And Leases Receivable [Line Items]    
Loan delinquent period 150 days  
Commercial Real Estate [Member] | Asset Pledged as Collateral without Right [Member]    
Loans And Leases Receivable [Line Items]    
Loans pledged to secure outstanding borrowings $ 16,500  
Commercial Real Estate [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   16,300
Residential Mortgage Loans [Member] | Asset Pledged as Collateral without Right [Member]    
Loans And Leases Receivable [Line Items]    
Loans pledged to secure outstanding borrowings 19,500  
Residential Mortgage Loans [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   19,500
Residential Mortgage Loans [Member] | One-to-Four Family Residential [Member]    
Loans And Leases Receivable [Line Items]    
Mortgage loans held for sale 152 32
Commercial Real Estate Loans [Member] | One-to-Four Family Residential [Member]    
Loans And Leases Receivable [Line Items]    
Mortgage loans held for sale 321 131
Commercial Loans and Leases [Member] | Asset Pledged as Collateral without Right [Member]    
Loans And Leases Receivable [Line Items]    
Loans pledged to secure outstanding borrowings 11,600  
Commercial Loans and Leases [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   10,500
Home Equity Loans and Lines of Credit [Member] | Asset Pledged as Collateral without Right [Member]    
Loans And Leases Receivable [Line Items]    
Loans pledged to secure outstanding borrowings 2,400  
Home Equity Loans and Lines of Credit [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   2,400
Other Consumer Loans [Member] | Asset Pledged as Collateral without Right [Member]    
Loans And Leases Receivable [Line Items]    
Loans pledged to secure outstanding borrowings $ 11,100  
Other Consumer Loans [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   $ 10,700
Commercial Loans [Member]    
Loans And Leases Receivable [Line Items]    
Weighted-average remaining term 1 year 1 month 6 days  
Commercial Real Estate Loans [Member]    
Loans And Leases Receivable [Line Items]    
Weighted-average remaining term 1 year 2 months 12 days  
Commercial Loans and Commercial Real Estate [Member] | Minimum [Member]    
Loans And Leases Receivable [Line Items]    
Amount of real estate loan as reported as accruing or nonaccruing $ 1  
Residential Real Estate Loans [Member]    
Loans And Leases Receivable [Line Items]    
Weighted-average remaining term 9 years 1 month 6 days