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Credit Quality And Allowance For Credit Losses Credit Quality And Allowance For Credit Losses (Troubled Debt Restructuring Subsequent Default) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
 [1]
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period $ 73 $ 10
Business loans | Commercial borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 43 8
Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 26 8
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [2] 3 0
Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [2] 14 0
Retail loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 30 2
Retail loans | Consumer borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 3 2
Retail loans | Residential mortgage | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 27 0
Retail loans | Home equity | Consumer borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [3] 2 2
Retail loans | Other consumer | Consumer borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 1 0
Principal deferrals    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [4] 44 8
Principal deferrals | Business loans | Commercial borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [4] 43 8
Principal deferrals | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [4] 26 8
Principal deferrals | Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [2],[4] 3 0
Principal deferrals | Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [2],[4] 14 0
Principal deferrals | Retail loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [4] 1 0
Principal deferrals | Retail loans | Consumer borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [4] 1 0
Principal deferrals | Retail loans | Residential mortgage | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [4] 0 0
Principal deferrals | Retail loans | Home equity | Consumer borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [3],[4] 1 0
Principal deferrals | Retail loans | Other consumer | Consumer borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [4] 0 0
Interest Rate Reductions    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 29 2
Interest Rate Reductions | Business loans | Commercial borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 0 0
Interest Rate Reductions | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 0 0
Interest Rate Reductions | Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [2] 0 0
Interest Rate Reductions | Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [2] 0 0
Interest Rate Reductions | Retail loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 29 2
Interest Rate Reductions | Retail loans | Consumer borrower    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 2 2
Interest Rate Reductions | Retail loans | Residential mortgage | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period 27 0
Interest Rate Reductions | Retail loans | Home equity | Consumer borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period [3] 1 2
Interest Rate Reductions | Retail loans | Other consumer | Consumer borrower | Domestic loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Recorded balance of troubled debt restructuring modified during the period $ 1 $ 0
[1] Under the provisions of the CARES Act, qualifying COVID-19-related modifications, primarily principal deferrals, were not considered TDRs during the year ended December 31, 2021.
[2] Primarily loans secured by owner-occupied real estate.
[3] Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.
[4] 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.