v3.26.1
Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans pledged at the Federal Home Loan Bank $ 402,655   $ 402,655   $ 383,730
Loans pledged at the Federal Reserve Bank 94,600   94,600   90,000
Net unearned interest and deferred fees and costs on originated loans and unamortized premiums and discounts on purchased loans $ 1,900   $ 1,900   2,000
Reasonable and supportable period for allowance for credit loss 3 years   3 years    
Foreclosed residential real estate property included in other real estate owned $ 24   $ 24   24
Foreclosed residential real estate related to mortgage loans whose payments are insured by the Federal Housing Administration or guaranteed by the United States Department of Veterans Affairs 81   81   65
Residential mortgage loans secured by residential real estate in process of foreclosure 902   902   705
Modified loans 1,098 $ 1,468 2,027 $ 2,686  
Commitments to lend $ 270   270    
Trial Modifications          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Modified loans     $ 422    
Credit card          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan modification amortization period 60 months   60 months    
GNMA loans upon foreclosure          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Residential mortgage loans secured by residential real estate in process of foreclosure $ 654   $ 654   458
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period to be placed on nonaccrual status 90 days   90 days    
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan modification amortization period 60 months   60 months    
Consumer | Residential Mortgages and Other Retail Loans Secured by 1-4 Family Properties          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period for charge-off to fair value of collateral less costs to sell 180 days   180 days    
Consumer | Residential Mortgages Loans and Junior Liens Secured by 1-4 Family Properties          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period to be placed on nonaccrual status 120 days   120 days    
Consumer | First Lien          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period to be placed on nonaccrual status 180 days   180 days    
Consumer | Credit card          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period past due for charge-off 180 days   180 days    
Modified loans $ 152 $ 147 $ 304 $ 292  
Consumer | Other Retail Loans not Secured by 1-4 Family Properties          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period past due for charge-off 120 days   120 days    
Consumer | Revolving Consumer Lines          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period past due for charge-off 180 days   180 days    
Federal Home Loan Bank          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans pledged at the Federal Home Loan Bank $ 126,600   $ 126,600   $ 127,800