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Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings) (Details) - Principal Deferrals - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans | $ 26 | $ 40
Commercial | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans |  | 39
Commercial | Commercial | Domestic |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans | 15 | 21
Commercial | Commercial | Real estate construction: | Domestic | Other business lines |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans | 3 | 3
Commercial | Commercial | Commercial mortgage: | Domestic | Other business lines |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans | $ 8 | 15
Consumer: | Consumer | Home equity | Domestic |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans |  | $ 1

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