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Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest $ 257 $ 271  
Net loans and leases 63,418 61,750  
Loans and leases 64,156 62,565  
Financing receivable, allowance for credit loss, writeoff, collateral $ 3 2  
Credit card workout program rate reduction, interest rate floor 0.00%    
Credit card workout program term extension, maximum period 5 years    
Loans modified with subsequent default, amount $ 16 19 $ 28
Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Credit card hardship program, rate and payment reduction, period 6 months    
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Credit card hardship program, rate and payment reduction, period 1 year    
Commercial | Collateral Pledged      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 400 352  
Commercial | Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial loan grades 1    
Commercial | Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial loan grades 16    
Commercial | Loans to mortgage companies      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 4,703 3,471  
Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 35,905 33,428  
Commercial | Commercial and industrial | Financial Services Industry Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage contributed 25.00%    
Commercial | Commercial and industrial | Finance And Insurance Companies      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 4,100    
Commercial | Commercial and industrial | General C I | Collateral Pledged      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 160    
Commercial | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 13,563 14,421  
Commercial | Commercial real estate | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 13,563 14,421  
Commercial | Commercial real estate | Commercial Real Estate | Collateral Pledged      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 240    
Asset Pledged as Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net loans and leases 45,100 45,800  
Asset Pledged as Collateral | General C I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, allowance for credit loss, writeoff, collateral 66 75  
Asset Pledged as Collateral | HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 5 6  
Asset Pledged as Collateral | Real estate installment loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 46 $ 36