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Loans and Related Allowance for Credit Losses (Financial Effect of Loan Modification) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1,033 | $ 829 | $ 2,191 | $ 2,686
Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 667 | 626 | 1,619 | 1,858
Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 0 | 0 | 0 | 27
Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 149 | 137 | 227 | 212
Commercial and industrial | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 501 | $ 389 | $ 1,091 | $ 1,188
Weighted average extended contract term | 25 months | 11 months | 23 months | 14 months
Commercial and industrial | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 23 | $ 11 | $ 37 | $ 146
Weighted average interest rate reduction | 3.41% | 1.52% | 2.57% | 1.45%
Commercial and industrial | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 73 | $ 25 | $ 120 | $ 206
Weighted average payment deferral term | 2 months | 3 months | 6 months | 8 months
Commercial real estate | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 241 | $ 253 | $ 631 | $ 1,073
Weighted average extended contract term | 6 months | 17 months | 14 months | 15 months
Commercial real estate | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 27 |  | $ 27 |
Weighted average interest rate reduction | 1.04% |  | 1.04% |
Commercial real estate | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 29 | $ 87 | $ 29 | $ 248
Weighted average payment deferral term | 6 months | 8 months | 6 months | 7 months
Residential real estate | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 | $ 1 | $ 5 | $ 4
Weighted average extended contract term | 162 months | 28 months | 172 months | 81 months
Residential real estate | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 | $ 1 | $ 4 | $ 3
Weighted average interest rate reduction | 1.73% | 1.48% | 1.25% | 0.83%
Residential real estate | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 71 | $ 28 | $ 130 | $ 67
Weighted average payment deferral term | 9 months | 10 months | 9 months | 9 months
Education | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 | $ 1 | $ 4 | $ 4
Weighted average extended contract term | 11 months | 12 months | 16 months | 12 months
Home equity | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 2 | $ 3 | $ 5 | $ 10
Weighted average payment deferral term | 5 months | 5 months | 5 months | 4 months
Other consumer | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  |  | $ 2 |
Weighted average extended contract term |  |  | 32 months |
Other consumer | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  |  | $ 1 |
Weighted average payment deferral term |  |  | 24 months |

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