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Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable no allowance | $ 237 | $ 280
Loans, net of unearned income | 96,862 | 98,379
Defaulted during period as modification to troubled borrower, twelve months prior to modification | 79 |
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 54,795 | 56,033
Total Investor Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 8,763 | 8,850
Consumer Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 33,304 | 33,496
Collateral Dependent Member | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 348 | 220
Collateral Dependent Member | Total Investor Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 203 | 92
Collateral Dependent Member | Consumer Portfolio Segment [Member] | residential real estate and home equity loan and lines |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | $ 108 | $ 93

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