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Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings) (Details) - Principal Deferrals $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($) | [1]
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans | $ 23 |
Commercial | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans | 21 |
Consumer: | Consumer | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total loans | $ 2 | [2]
[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] | Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

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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 https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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