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Credit Quality And Allowance For Credit Losses (Loan Modifications Made to Borrowers Experiencing Financial Difficulty) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 16
Percent of Total Class 0.03%
Term Extension (a)  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 10 [1]
Other  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 6 [2]
Business loans:  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 15
Percent of Total Class 0.03%
Business loans: | Term Extension (a)  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 9 [1]
Business loans: | Other  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 6 [2]
Business loans: | Commercial  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 8
Percent of Total Class 0.02%
Business loans: | Commercial | Commercial mortgage:  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 7
Percent of Total Class 0.05%
Business loans: | Commercial | Commercial mortgage: | Commercial  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 6 [3]
Percent of Total Class 0.11% [3]
Business loans: | Commercial | Commercial mortgage: | Other business lines  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 1 [4]
Percent of Total Class 0.02% [4]
Business loans: | Commercial | Term Extension (a)  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 7 [1]
Business loans: | Commercial | Term Extension (a) | Commercial mortgage:  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 2 [1]
Business loans: | Commercial | Term Extension (a) | Commercial mortgage: | Commercial  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 1 [1],[3]
Business loans: | Commercial | Term Extension (a) | Commercial mortgage: | Other business lines  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 1 [1],[4]
Business loans: | Commercial | Other  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 1 [2]
Business loans: | Commercial | Other | Commercial mortgage:  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 5 [2]
Business loans: | Commercial | Other | Commercial mortgage: | Commercial  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 5 [2],[3]
Business loans: | Commercial | Other | Commercial mortgage: | Other business lines  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 0 [2],[4]
Retail loans:  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 1
Percent of Total Class 0.02%
Retail loans: | Term Extension (a)  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 1 [1]
Retail loans: | Other  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 0 [2]
Retail loans: | Consumer  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 1
Percent of Total Class 0.04%
Retail loans: | Consumer | Consumer:  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 1
Percent of Total Class 0.10%
Retail loans: | Consumer | Term Extension (a)  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 1 [1]
Retail loans: | Consumer | Term Extension (a) | Consumer:  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 1 [1]
Retail loans: | Consumer | Other  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 0 [2]
Retail loans: | Consumer | Other | Consumer:  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 0 [2]
[1] Represents loan balances where terms were extended by more than an insignificant time period, typically more than 180 days, at or above contractual interest rates.
[2] Relates to FDMs where more than one type of modification was made. For the three months ended March 31, 2023, this primarily related to modifications where the interest rate was reduced and the term was extended.
[3] Primarily loans to real estate developers.
[4] Primarily loans secured by owner-occupied real estate.