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Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans $ 39 $ 58  
Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans     $ 52
Commercial | Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 34    
Commercial | Commercial | Domestic      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 27 34  
Commercial | Commercial | Real estate construction: | Domestic | Other business lines      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans     3
Commercial | Commercial | Commercial mortgage: | Domestic | Other business lines      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 7   15
Consumer: | Residential mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 5 5  
Principal Deferrals      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 34   53
Principal Deferrals | Commercial | Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 34   52
Principal Deferrals | Commercial | Commercial | Domestic      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 27   34
Principal Deferrals | Commercial | Commercial | Real estate construction: | Domestic | Other business lines      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans     3
Principal Deferrals | Commercial | Commercial | Commercial mortgage: | Domestic | Other business lines      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 7   15
Principal Deferrals | Consumer: | Consumer | Home equity | Domestic      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans     $ 1
Interest Rate Reduction      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans 5 5  
Interest Rate Reduction | Consumer: | Residential mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total loans $ 5 $ 5