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Loans And The Allowance For Credit Losses (Financial Impact Of Modifications To Troubled Borrowers) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Financing Receivable, Modifications [Line Items] |  |
Defaulted during period as modification to troubled borrower, twelve months prior to modification | $ 24 | $ 79
Commercial And Industrial [Member] | Contractual Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 1.00% |
Commercial And Industrial [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 5 months 1 day | 1 year
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 0.00% |
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 1 year 11 months 1 day | 8 months 1 day
Commercial investor real estate mortgage [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 8 months 1 day | 6 months 29 days
Residential First Mortgage [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 7 years | 6 years
Residential First Mortgage [Member] | Payment Deferral |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Payments deferral | 0.67 |
Residential First Mortgage [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 2 years | 9 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 1.00% | 1.00%
Home Equity Lines of Credit[Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 30 years |
Home Equity Lines of Credit[Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 23 years | 19 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 2.00% | 2.00%
Home Equity Loan [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 13 years | 12 years
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 21 years | 25 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 2.00% | 2.00%

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