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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Net charge-offs | $ 162 | $ 192 |  | $ 529 | $ 557 |  |  |
Credit provision | 154 | 172 |  | 471 | 525 |  |  |
Decrease to ACL |  |  |  | 58 |  |  |  |
Loans held for sale | 1,334 |  |  | 1,334 |  | $ 1,334 | $ 858 |
Loans and leases | 140,870 |  |  | 140,870 |  | 140,870 | 139,203 |
Mortgage loans collateralized by OREO | 299 |  |  | 299 |  | 299 | 295 |
Amortized cost basis | 718 | 498 |  | 1,396 | 1,331 | 1,714 |  | $ 1,486
Non-Core |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Net charge-offs |  |  |  | 25 |  |  |  |
Loans held for sale | 1,900 |  |  | 1,900 |  | 1,900 |  |
Proceeds from sale of loans held for sale |  |  |  | 1,400 |  |  |  |
Non-Core | Forecast |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of loans held for sale |  |  | $ 500 |  |  |  |  |
Retail |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Net charge-offs | 77 | 94 |  | 271 | 278 |  |  |
Loans held for sale | 592 |  |  | 592 |  | 592 | 633 |
Loans and leases | 68,377 |  |  | 68,377 |  | 68,377 | 69,427 |
Amortized cost basis | 51 | 54 |  | 113 | 163 | 154 |  | 215
Commercial |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Net charge-offs | 85 | 98 |  | 258 | 279 |  |  |
Loans held for sale | 276 |  |  | 276 |  | 276 | 225 |
Loans and leases | 72,493 |  |  | 72,493 |  | 72,493 | 69,776 |
Amortized cost basis | 667 | 444 |  | 1,283 | 1,168 | 1,560 |  | 1,271
Commercial and industrial | Commercial |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Loans and leases | 46,953 |  |  | 46,953 |  | 46,953 | 42,551 |
Amortized cost basis | 155 | $ 104 |  | 350 | $ 289 | 445 |  | $ 301
Unfunded loan commitment |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Amortized cost basis |  |  |  | 342 |  |  | 206 |
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Loans and leases | 427 |  |  | 427 |  | 427 | 372 |
Collateral Dependent | Commercial and industrial | Commercial |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Loans and leases | $ 250 |  |  | $ 250 |  | $ 250 | $ 607 |

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