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Loans And The Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable no allowance | $ 195 | $ 195 | $ 280
Loans, net of unearned income | 96,789 | 96,789 | 98,379
Defaulted during period as modification to troubled borrower, twelve months prior to modification | 49 | 183 |
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income | 54,779 | 54,779 | 56,033
Commercial Portfolio Segment [Member] | Extended Maturity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated | 65 | 65 | 106
Total Investor Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income | 8,812 | 8,812 | 8,850
Consumer Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income | 33,198 | 33,198 | 33,496
Collateral Dependent Member | Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income | 218 | 218 | 220
Collateral Dependent Member | Total Investor Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income | 199 | 199 | 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 | $ 113 | $ 113 | $ 93

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