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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables) | 12 Months Ended
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Dec. 31, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive (Loss) Income | The following table includes the components of AOCI: Components of Accumulated Other Comprehensive Loss
dollars in millions | December 31, 2025 |  | December 31, 2024
| Pretax |  | Income Taxes |  | Net of Income Taxes |  | Pretax |  | Income Taxes |  | Net of Income Taxes
Unrealized loss on securities available for sale | $ | (162) |  |  | $ | 25 |  |  | $ | (137) |  |  | $ | (762) |  |  | $ | 178 |  |  | $ | (584) |
Unrealized loss on securities available for sale transferred to held to maturity | (5) |  |  | 1 |  |  | (4) |  |  | (6) |  |  | 2 |  |  | (4) |
Defined benefit pension items | 282 |  |  | (72) |  |  | 210 |  |  | 182 |  |  | (47) |  |  | 135 |
Unrealized gain on cash flow hedge derivatives | 19 |  |  | (5) |  |  | 14 |  |  | 11 |  |  | (3) |  |  | 8 |
Total accumulated other comprehensive income (loss) | $ | 134 |  |  | $ | (51) |  |  | $ | 83 |  |  | $ | (575) |  |  | $ | 130 |  |  | $ | (445) |
The following table summarizes the changes in the components of AOCI, net of income taxes: Changes in Accumulated Other Comprehensive (Loss) Income by Component
dollars in millions | Unrealized loss on securities available for sale |  | Unrealized loss on securities available for sale transferred to held to maturity |  | Defined benefit pension items |  |  |  | Unrealized gain on cash flow hedge derivatives |  | Total accumulated other comprehensive (loss) income
Balance as of December 31, 2024 | $ | (584) |  |  | $ | (4) |  |  | $ | 135 |  |  |  |  | $ | 8 |  |  | $ | (445) |
AOCI activity before reclassifications | 449 |  |  | — |  |  | 75 |  |  |  |  | 9 |  |  | 533 |
Amounts reclassified from AOCI to earnings | (2) |  |  | — |  |  | — |  |  |  |  | (3) |  |  | (5) |
Other comprehensive income for the period | 447 |  |  | — |  |  | 75 |  |  |  |  | 6 |  |  | 528 |
Balance as of December 31, 2025 | $ | (137) |  |  | $ | (4) |  |  | $ | 210 |  |  |  |  | $ | 14 |  |  | $ | 83 |
Balance as of December 31, 2023 | $ | (577) |  |  | $ | (5) |  |  | $ | 91 |  |  |  |  | $ | — |  |  | $ | (491) |
AOCI activity before reclassifications | (7) |  |  | — |  |  | 44 |  |  |  |  | 8 |  |  | 45 |
Amounts reclassified from AOCI to earnings | — |  |  | 1 |  |  | — |  |  |  |  | — |  |  | 1 |
Other comprehensive (loss) income for the period | (7) |  |  | 1 |  |  | 44 |  |  |  |  | 8 |  |  | 46 |
Balance as of December 31, 2024 | $ | (584) |  |  | $ | (4) |  |  | $ | 135 |  |  |  |  | $ | 8 |  |  | $ | (445) |
The following table presents the pretax and after tax components of other comprehensive income: Other Comprehensive Income (Loss) by Component
dollars in millions | Year Ended December 31, |  |
| 2025 |  | 2024 |  |
| Pretax |  | Income Taxes |  | Net of Income Taxes |  | Pretax |  | Income Taxes |  | Net of Income Taxes |  | Income Statement Line Items
Unrealized loss on securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI activity before reclassifications | $ | 603 |  |  | $ | (154) |  |  | $ | 449 |  |  | $ | (10) |  |  | $ | 3 |  |  | $ | (7) |  |  |
Amounts reclassified from AOCI to earnings | (3) |  |  | 1 |  |  | (2) |  |  | — |  |  | — |  |  | — |  |  | Realized gain on sale of investment securities, net
Other comprehensive income (loss) on securities available for sale | $ | 600 |  |  | $ | (153) |  |  | $ | 447 |  |  | $ | (10) |  |  | $ | 3 |  |  | $ | (7) |  |  |
Unrealized loss on securities available for sale transferred to held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified from AOCI to earnings | $ | 1 |  |  | $ | (1) |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | Interest income on investment securities
Defined benefit pension items: |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial gain | $ | 100 |  |  | $ | (25) |  |  | $ | 75 |  |  | $ | 60 |  |  | $ | (16) |  |  | $ | 44 |  |  |
Unrealized gain on cash flow hedge derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI activity before reclassifications | $ | 12 |  |  | $ | (3) |  |  | $ | 9 |  |  | $ | 11 |  |  | $ | (3) |  |  | $ | 8 |  |  |
Amounts reclassified from AOCI to earnings | (4) |  |  | 1 |  |  | (3) |  |  | — |  |  | — |  |  | — |  |  | Interest income on loans and leases
Other comprehensive income on cash flow hedge derivatives | $ | 8 |  |  | $ | (2) |  |  | $ | 6 |  |  | $ | 11 |  |  | $ | (3) |  |  | $ | 8 |  |  |
Total other comprehensive income | $ | 709 |  |  | $ | (181) |  |  | $ | 528 |  |  | $ | 62 |  |  | $ | (16) |  |  | $ | 46 |  |  |

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