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Loans And The Allowance For Credit Losses (Financial Impact Of Modifications To Troubled Borrowers) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Modifications [Line Items] |  |
Defaulted during period as modification to troubled borrower, twelve months prior to modification | $ 257 | $ 116
Commercial And Industrial [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 1 year 11 months 1 day | 1 year
Commercial And Industrial [Member] | Payment Deferral |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Payments deferral |  | 0.5
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 2 years 29 days |
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 1.00% |
Commercial And Industrial [Member] | Extended Maturity and Payment Deferral |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension |  | 3 years
Financial Effect, Payments deferral |  | 3
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 3 years 6 months 29 days | 1 year 6 months
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension |  | 3 months
Commercial investor real estate mortgage [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 9 months 29 days | 9 months 29 days
Commercial investor real estate mortgage [Member] | Contractual Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 1.00% |
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 | 0.83
Residential First Mortgage [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 5 years | 7 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 |  | 18 years
Home Equity Lines of Credit[Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 23 years | 21 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 2.00% | 1.00%
Home Equity Loan [Member] | Extended Maturity |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 14 years | 14 years
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Modifications [Line Items] |  |
Financial Effect, Term Extension | 24 years | 17 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification | 3.00% | 2.00%

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