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Credit Quality and the Allowance for Loan and Lease Losses - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
contract
Jun. 30, 2023
USD ($)
Jun. 30, 2022
contract
Dec. 31, 2022
USD ($)
Financing Receivable, Allowance for Credit Losses          
Mortgage loans in process of foreclosure amount $ 159   $ 159   $ 154
Loan modification program, loan amortized cost basis, threshold for modification $ 331   $ 444    
Loan modification program, threshold for modification, percent of total loans and leases 0.0027   0.0036    
Unfunded commitment amounts $ 160   $ 160    
Modification program option, threshold period past due     90 days    
Number of Contracts | contract   188   360  
Line Of Credit Receivable          
Financing Receivable, Allowance for Credit Losses          
Unfunded commitment amounts         130
Letter Of Credit Receivable          
Financing Receivable, Allowance for Credit Losses          
Unfunded commitment amounts         $ 60
Consumer and residential mortgage loans          
Financing Receivable, Allowance for Credit Losses          
Loan modification program, loans excluded from modification program 9   $ 20    
Commercial | Minimum          
Financing Receivable, Allowance for Credit Losses          
Modification program option, mortgage interest payment deferral, term     3 months    
Commercial | Maximum          
Financing Receivable, Allowance for Credit Losses          
Modification program option, mortgage interest payment deferral, term     12 months    
Residential Mortgage          
Financing Receivable, Allowance for Credit Losses          
Modification program option, mortgage term     480 months    
Modification program option, in-process modifications $ 17   $ 17    
Number of Contracts | contract   77   106  
Residential Mortgage | Minimum          
Financing Receivable, Allowance for Credit Losses          
Modification program option, mortgage interest payment deferral, term     6 months    
Modification program option, trial period     3 months    
Residential Mortgage | Maximum          
Financing Receivable, Allowance for Credit Losses          
Modification program option, mortgage interest payment deferral, term     12 months    
Modification program option, trial period     4 months    
Consumer          
Financing Receivable, Allowance for Credit Losses          
Modification program option, mortgage term     360 months