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OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2025
Equity [Abstract] |
Schedule of Changes in AOCI, Net of Tax, by Component | The following table presents changes in AOCI, net of tax, by component: TABLE 20.1
(in millions) | Unrealized Net Gains (Losses) on Debt Securities Available for Sale |  | Unrealized Net Gains (Losses) on Derivative Instruments |  | Unrecognized Pension and Postretirement Obligations |  | Total
Year Ended December 31, 2025 |  |  |  |  |  |  |
Balance at beginning of period | $ | (119) |  |  | $ | (15) |  |  | $ | (35) |  |  | $ | (169) |
Other comprehensive income (loss) before reclassifications | 76 |  |  | 10 |  |  | 5 |  |  | 91 |
Amounts reclassified from AOCI | — |  |  | 15 |  |  | — |  |  | 15 |
Net current period other comprehensive income (loss) | 76 |  |  | 25 |  |  | 5 |  |  | 106 |
Balance at end of period | $ | (43) |  |  | $ | 10 |  |  | $ | (30) |  |  | $ | (63) |

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