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Credit Quality and the Allowance for Loan and Lease Losses - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses          
Mortgage loans in process of foreclosure amount $ 100   $ 100   $ 94
Financing receivable, excluding accrued interest, modified in period, amount $ 349 $ 184 $ 609 $ 373  
Loan modification program, percentage of modifications to total portfolio 0.28% 0.16% 0.49% 0.32%  
Loan modification program, loans excluded from modification program $ 18 $ 19 $ 42 $ 42  
Unfunded commitment amounts 106   106   $ 88
Commercial          
Financing Receivable, Allowance for Credit Losses          
Financing receivable, excluding accrued interest, modified in period, amount $ 308 $ 150 $ 507 $ 268  
Loan modification program, percentage of modifications to total portfolio 0.43% 0.22% 0.71% 0.39%  
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 $ 29 $ 22 $ 72 $ 74  
Loan modification program, percentage of modifications to total portfolio 0.16% 0.13% 0.41% 0.43%  
Modification program option, mortgage term     480 months    
Modification program option, in-process modifications $ 3 $ 4 $ 3 $ 4  
Residential Mortgage | Minimum          
Financing Receivable, Allowance for Credit Losses          
Modification program option, mortgage interest payment deferral, term     6 months    
Residential Mortgage | Maximum          
Financing Receivable, Allowance for Credit Losses          
Modification program option, mortgage interest payment deferral, term     12 months    
Consumer          
Financing Receivable, Allowance for Credit Losses          
Financing receivable, excluding accrued interest, modified in period, amount $ 12 $ 12 $ 30 $ 31  
Loan modification program, percentage of modifications to total portfolio 0.04% 0.04% 0.10% 0.11%  
Consumer | Home equity          
Financing Receivable, Allowance for Credit Losses          
Financing receivable, excluding accrued interest, modified in period, amount $ 5 $ 4 $ 11 $ 11  
Loan modification program, percentage of modifications to total portfolio 0.11% 0.10% 0.24% 0.27%  
Modification program option, mortgage term     360 months