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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.

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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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