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Loans and Related Allowance for Credit Losses (Financial Effect of Loan Modification) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 2,925 | $ 2,270
Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | 1,967 | 1,506
Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | 14 | 62
Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | 225 | 170
Commercial and industrial | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 1,260 | $ 857
Weighted average increase from modification | 16 months | 12 months
Commercial and industrial | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 140 | $ 45
Weighted average interest rate reduction | 1.42% | 2.70%
Commercial and industrial | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 203 | $ 235
Weighted average payment deferral term | 8 months | 3 months
Commercial real estate | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 1,196 | $ 833
Weighted average increase from modification | 17 months | 14 months
Commercial real estate | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified |  | $ 47
Weighted average interest rate reduction |  | 4.54%
Commercial real estate | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 326 | $ 17
Weighted average payment deferral term | 8 months | 5 months
Equipment lease financing | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 2 |
Weighted average increase from modification | 43 months |
Residential real estate | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 7 | $ 6
Weighted average increase from modification | 94 months | 80 months
Residential real estate | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 6 | $ 7
Weighted average interest rate reduction | 2.00% | 1.34%
Residential real estate | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 84 | $ 95
Weighted average payment deferral term | 9 months | 9 months
Education | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 5 | $ 5
Weighted average increase from modification | 13 months | 20 months
Home equity | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified |  | $ 1
Weighted average increase from modification |  | 232 months
Home equity | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis, modified | $ 13 | $ 10
Weighted average payment deferral term | 4 months | 4 months

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