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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 829 | $ 904 | $ 2,686 | $ 1,946
Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 626 | 664 | 1,858 | 1,452
Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  | 16 | 27 | 16
Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 137 | 105 | 212 | 196
Commercial and industrial | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 389 | $ 363 | $ 1,188 | $ 724
Weighted average extended contract term | 11 months | 13 months | 14 months | 12 months
Commercial and industrial | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 11 | $ 15 | $ 146 | $ 15
Weighted average interest rate reduction | 1.52% | 0.25% | 1.45% | 0.25%
Commercial and industrial | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 25 | $ 44 | $ 206 | $ 111
Weighted average payment deferral term | 3 months | 6 months | 8 months | 6 months
Commercial real estate | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 253 | $ 307 | $ 1,073 | $ 745
Weighted average extended contract term | 17 months | 13 months | 15 months | 16 months
Commercial real estate | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 87 | $ 16 | $ 248 | $ 16
Weighted average payment deferral term | 8 months | 8 months | 7 months | 8 months
Residential real estate | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 |  | $ 4 | $ 3
Weighted average extended contract term | 28 months |  | 81 months | 118 months
Residential real estate | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 | $ 1 | $ 3 | $ 4
Weighted average interest rate reduction | 1.48% | 0.72% | 0.83% | 1.13%
Residential real estate | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 28 | $ 50 | $ 67 | $ 83
Weighted average payment deferral term | 10 months | 10 months | 9 months | 9 months
Education | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 | $ 1 | $ 4 | $ 3
Weighted average extended contract term | 12 months | 15 months | 12 months | 16 months
Home equity | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 3 | $ 2 | $ 10 | $ 6
Weighted average payment deferral term | 5 months | 5 months | 4 months | 4 months

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