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Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings Subsequent Default) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Principal Deferrals |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [1] | $ 26 |  | $ 40 |
Principal Deferrals | Business loans | Commercial borrower |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [1] | 26 |  | 39 |
Principal Deferrals | Business loans | Commercial borrower | Domestic loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [1] | 15 |  | 21 |
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],[2] | 8 |  | 15 |
Principal Deferrals | Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [1],[2] | 3 |  | 3 |
Principal Deferrals | Retail loans | Home equity | Home equity | Domestic loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [1],[3] | 0 |  | 1 |
Principal Deferrals | Retail loans | Residential mortgage | Domestic loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [1] | $ 0 |  | $ 0 |
Interest Rate Reductions |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [4] |  | $ 7 |  | $ 7
Interest Rate Reductions | Business loans | Commercial borrower |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [4] |  | 0 |  | 0
Interest Rate Reductions | Business loans | Commercial borrower | Domestic loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [4] |  | 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 | [2],[4] |  | 0 |  | 0
Interest Rate Reductions | Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [2],[4] |  | 0 |  | 0
Interest Rate Reductions | Retail loans | Home equity | Home equity | Domestic loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [3],[4] |  | 1 |  | 1
Interest Rate Reductions | Retail loans | Residential mortgage | Domestic loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | [4] |  | $ 6 |  | $ 6
[1] | 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.
[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] | Under the provisions of the CARES Act, qualifying COVID-19-related modifications, primarily principal deferrals, were not considered TDRs during the six months ended June 30, 2021.

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