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Loans and Related Allowance for Credit Losses (Subsequent Default) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | $ 323 | $ 331
Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  | 47
Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 133 | 53
Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 96 | 196
Repayment Plan |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 33 | 16
Payment Deferral and Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 40 |
Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 21 | 19
Total commercial lending |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 223 | 272
Total commercial lending | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  | 46
Total commercial lending | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 133 | 53
Total commercial lending | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 50 | 166
Total commercial lending | Payment Deferral and Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 40 |
Total commercial lending | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  | 7
Total commercial lending | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 107 | 211
Total commercial lending | Commercial and industrial | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 87 | 38
Total commercial lending | Commercial and industrial | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 17 | 166
Total commercial lending | Commercial and industrial | Payment Deferral and Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 3 |
Total commercial lending | Commercial and industrial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  | 7
Total commercial lending | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 116 | 61
Total commercial lending | Commercial real estate | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  | 46
Total commercial lending | Commercial real estate | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 46 | 15
Total commercial lending | Commercial real estate | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 33 |
Total commercial lending | Commercial real estate | Payment Deferral and Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 37 |
Total consumer lending |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 100 | 59
Total consumer lending | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  | 1
Total consumer lending | Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  |
Total consumer lending | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 46 | 30
Total consumer lending | Repayment Plan |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 33 | 16
Total consumer lending | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 21 | 12
Total consumer lending | Residential real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 51 | 31
Total consumer lending | Residential real estate | Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  | 1
Total consumer lending | Residential real estate | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 43 | 28
Total consumer lending | Residential real estate | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 8 | 2
Total consumer lending | Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 17 | 12
Total consumer lending | Home equity | Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 3 | 2
Total consumer lending | Home equity | Repayment Plan |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 1 |
Total consumer lending | Home equity | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 13 | 10
Total consumer lending | Credit card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | 32 | 16
Total consumer lending | Credit card | Repayment Plan |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default | $ 32 | 16
Total consumer lending | Credit card | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Subsequent default |  |

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