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Credit Quality and the Allowance for Loan and Lease 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
Financing Receivable, Allowance for Credit Losses          
Mortgage loans in process of foreclosure amount $ 189   $ 189   $ 110
Financing receivable, excluding accrued interest, modified in period, amount $ 737 $ 377 $ 1,100 $ 526  
Loan modification program, percentage of modifications to total portfolio 0.41% 0.31% 0.59% 0.43%  
Loan modification program, loans excluded from modification program $ 22 $ 19 $ 38 $ 31  
Unfunded commitment amounts 321   321   $ 69
Commercial          
Financing Receivable, Allowance for Credit Losses          
Financing receivable, excluding accrued interest, modified in period, amount $ 720 $ 333 $ 1,009 $ 455  
Loan modification program, percentage of modifications to total portfolio 0.59% 0.47% 0.83% 0.64%  
Commercial | Minimum          
Financing Receivable, Allowance for Credit Losses          
Term extension period     3 months    
Commercial | Maximum          
Financing Receivable, Allowance for Credit Losses          
Term extension period     12 months    
Residential Mortgage          
Financing Receivable, Allowance for Credit Losses          
Financing receivable, excluding accrued interest, modified in period, amount $ 7 $ 34 $ 23 $ 51  
Loan modification program, percentage of modifications to total portfolio 0.04% 0.19% 0.12% 0.29%  
Modification program option, in-process modifications $ 69 $ 3 $ 69 $ 3  
Consumer          
Financing Receivable, Allowance for Credit Losses          
Financing receivable, excluding accrued interest, modified in period, amount $ 10 $ 10 $ 21 $ 20  
Loan modification program, percentage of modifications to total portfolio 0.03% 0.03% 0.06% 0.07%  
Consumer | Home equity          
Financing Receivable, Allowance for Credit Losses          
Financing receivable, excluding accrued interest, modified in period, amount $ 3 $ 3 $ 8 $ 7  
Loan modification program, percentage of modifications to total portfolio 0.04% 0.07% 0.12% 0.16%