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Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings Subsequent Default) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 10 $ 22
Business loans | Commercial borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification 8 20
Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification 8 18
Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [1] 0 2
Retail loans | Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification 2 2
Retail loans | Home equity | Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [2] 2 2
Principal deferrals    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [3] 8 20
Principal deferrals | Business loans | Commercial borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [3] 8 20
Principal deferrals | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [3] 8 18
Principal deferrals | Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [1],[3] 0 2
Principal deferrals | Retail loans | Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [3] 0 0
Principal deferrals | Retail loans | Home equity | Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [2],[3] 0 0
Interest Rate Reductions    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification 2 2
Interest Rate Reductions | Business loans | Commercial borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification 0 0
Interest Rate Reductions | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification 0 0
Interest Rate Reductions | Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [1] 0 0
Interest Rate Reductions | Retail loans | Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification 2 2
Interest Rate Reductions | Retail loans | Home equity | Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Postmodification [2] $ 2 $ 2
[1] Primarily loans secured by owner-occupied real estate.
[2] Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.
[3] Primarily 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. Also includes commercial loans restructured in bankruptcy.