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Credit Quality and the Allowance for Loan and Lease Losses - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
contract
Mar. 31, 2022
contract
Dec. 31, 2022
USD ($)
Financing Receivable, Allowance for Credit Losses      
Mortgage loans in process of foreclosure amount $ 175   $ 154
Loan modification program, loan amortized cost basis, threshold for modification $ 202    
Loan modification program, threshold for modification, percent of total loans and leases 0.0016    
Unfunded commitment amounts $ 109    
Modification program option, threshold period past due 90 days    
Number of Contracts | contract 0 175  
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 $ 13    
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 $ 18    
Number of Contracts | contract   29  
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