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RETIREMENT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Accumulated Benefit Obligation, Change in Benefit Obligation, Change in Plan Assets, Plans' Funded Status and Amount Included in Consolidated Balance Sheets | The following table provides information relating to the accumulated benefit obligation, change in benefit obligation, change in plan assets, the plans’ funded status and the amount included in the Consolidated Balance Sheets for the qualified and non-qualified plans described above (collectively, the Plans): TABLE 18.1
December 31 | 2025 |  | 2024
(in millions) | Qualified |  | Non-Qualified |  | Total |  | Qualified |  | Non-Qualified |  | Total
Accumulated benefit obligation | $ | 107 |  |  | $ | 13 |  |  | $ | 120 |  |  | $ | 108 |  |  | $ | 14 |  |  | $ | 122 |
Projected benefit obligation at beginning of year | $ | 108 |  |  | $ | 14 |  |  | $ | 122 |  |  | $ | 116 |  |  | $ | 15 |  |  | $ | 131 |
Interest cost | 5 |  |  | 1 |  |  | 6 |  |  | 5 |  |  | 1 |  |  | 6 |
Actuarial loss (gain) | 3 |  |  | 1 |  |  | 4 |  |  | (4) |  |  | — |  |  | (4) |
Benefits paid | (9) |  |  | (3) |  |  | (12) |  |  | (9) |  |  | (2) |  |  | (11) |
Projected benefit obligation at end of year | $ | 107 |  |  | $ | 13 |  |  | $ | 120 |  |  | $ | 108 |  |  | $ | 14 |  |  | $ | 122 |
Fair value of plan assets at beginning of year | $ | 184 |  |  | $ | — |  |  | $ | 184 |  |  | $ | 178 |  |  | $ | — |  |  | $ | 178 |
Actual return on plan assets | 20 |  |  | — |  |  | 20 |  |  | 15 |  |  | — |  |  | 15 |
Corporation contribution | — |  |  | 3 |  |  | 3 |  |  | — |  |  | 2 |  |  | 2 |
Benefits paid | (9) |  |  | (3) |  |  | (12) |  |  | (9) |  |  | (2) |  |  | (11) |
Fair value of plan assets at end of year | $ | 195 |  |  | $ | — |  |  | $ | 195 |  |  | $ | 184 |  |  | $ | — |  |  | $ | 184 |
Funded status of plans | $ | 88 |  |  | $ | (13) |  |  | $ | 75 |  |  | $ | 76 |  |  | $ | (14) |  |  | $ | 62 |
Schedule of Actuarial Assumptions Used in Determination of Projected Benefit Obligation | Actuarial assumptions used in the determination of the projected benefit obligation in the Plans are as follows: TABLE 18.2
Assumptions at December 31 | 2025 |  | 2024
Weighted average discount rate | 5.16 | % |  | 5.48 | %
Schedule of Net Periodic Pension Cost and Other Comprehensive Income | The net periodic pension cost and OCI for the Plans included the following components: TABLE 18.3
Year Ended December 31 | 2025 |  | 2024 |  | 2023
(in millions) |  |  |  |  |
Interest cost | $ | 6 |  |  | $ | 6 |  |  | $ | 7 |
Expected return on plan assets | (12) |  |  | (12) |  |  | (11) |
Actuarial loss amortization | 1 |  |  | 2 |  |  | 2 |
Total pension cost (income) | (5) |  |  | (4) |  |  | (2) |
Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income): |  |  |  |  |
Current year actuarial (gain) loss | (5) |  |  | (8) |  |  | (1) |
Amortization of actuarial loss | (1) |  |  | (2) |  |  | (2) |
Total amount recognized in other comprehensive loss (income) | (6) |  |  | (10) |  |  | (3) |
Total amount recognized in net periodic benefit cost (benefit) and other comprehensive loss (income) | $ | (11) |  |  | $ | (14) |  |  | $ | (5) |
Schedule of Actuarial Assumptions Used in Determination of Net Periodic Pension Cost | Actuarial assumptions used in the determination of the net periodic pension cost in the Plans are as follows: TABLE 18.4
Assumptions for the Year Ended December 31 | 2025 |  | 2024 |  | 2023
Weighted average discount rate | 5.48 | % |  | 4.99 | % |  | 5.34 | %
Expected long-term rate of return on assets | 6.75 |  |  | 6.75 |  |  | 6.75 |
Rates of increase in compensation levels | n/a |  | n/a |  | 3.30 |
Schedule of Estimated Future Cash Flows | The following table provides information regarding estimated future cash flows relating to the Plans at December 31, 2025: TABLE 18.5
(in millions) |  |  |
Expected employer contributions: | 2026 |  | $ | — |
Expected benefit payments: | 2026 |  | 11 |
| 2027 |  | 11 |
| 2028 |  | 11 |
| 2029 |  | 11 |
| 2030 |  | 10 |
| 2031 – 2035 |  | 47 |
Schedule of Contribution Expense | Our contribution expense is presented in the following table: TABLE 18.6
Year Ended December 31 | 2025 |  | 2024 |  | 2023
(in millions) |  |  |  |  |
401(k) contribution expense | $ | 28 |  |  | $ | 21 |  |  | $ | 21 |
Schedule of Asset Allocations for Pension Plans | The following table presents asset allocations for our pension plans as of December 31, 2025 and 2024, and the target allocation for 2026, by asset category: TABLE 18.7
| Target Allocation |  | Percentage of Plan Assets
December 31 | 2026 |  | 2025 |  | 2024
Asset Category |  |  |  |  |
Equity securities | 45 - 65 |  | 61 | % |  | 60 | %
Debt securities | 30 - 50 |  | 36 |  |  | 36 |
Cash equivalents | 0 - 10 |  | 3 |  |  | 4 |
Schedule of Fair Values of Pension Plan Assets by Asset Category | The fair values of our pension plan assets by asset category are as follows: TABLE 18.8
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2025 |  |  |  |  |  |  |
Asset Class |  |  |  |  |  |  |
Cash | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7 |
Equity securities: |  |  |  |  |  |  |
F.N.B. Corporation | 3 |  |  | — |  |  | — |  |  | 3 |
Other large-cap U.S. financial services companies | 4 |  |  | — |  |  | — |  |  | 4 |
Other large-cap U.S. companies | 60 |  |  | — |  |  | — |  |  | 60 |
Other equity | 1 |  |  | — |  |  | — |  |  | 1 |
Mutual fund equity investments: |  |  |  |  |  |  |
U.S. equity index funds: |  |  |  |  |  |  |
U.S. small-cap equity index funds | 4 |  |  | — |  |  | — |  |  | 4 |
U.S. mid-cap equity index funds | 7 |  |  | — |  |  | — |  |  | 7 |
Non-U.S. equities growth fund | 12 |  |  | — |  |  | — |  |  | 12 |
U.S. equity funds: |  |  |  |  |  |  |
U.S. large-cap | 6 |  |  | — |  |  | — |  |  | 6 |
U.S. mid-cap | 11 |  |  | — |  |  | — |  |  | 11 |
U.S. small-cap | 4 |  |  | — |  |  | — |  |  | 4 |
Other | 6 |  |  | — |  |  | — |  |  | 6 |
Fixed income securities: |  |  |  |  |  |  |
U.S. Treasury bonds | 27 |  |  | — |  |  | — |  |  | 27 |
U.S. government agencies | — |  |  | 18 |  |  | — |  |  | 18 |
Fixed income mutual funds: |  |  |  |  |  |  |
U.S. investment-grade fixed income securities | 25 |  |  | — |  |  | — |  |  | 25 |
Total | $ | 177 |  |  | $ | 18 |  |  | $ | — |  |  | $ | 195 |
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2024 |  |  |  |  |  |  |
Asset Class |  |  |  |  |  |  |
Cash | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |
Equity securities: |  |  |  |  |  |  |
F.N.B. Corporation | 3 |  |  | — |  |  | — |  |  | 3 |
Other large-cap U.S. financial services companies | 3 |  |  | — |  |  | — |  |  | 3 |
Other large-cap U.S. companies | 58 |  |  | — |  |  | — |  |  | 58 |
Other equity | 1 |  |  | — |  |  | — |  |  | 1 |
Mutual fund equity investments: |  |  |  |  |  |  |
U.S. equity index funds: |  |  |  |  |  |  |
U.S. small-cap equity index funds | 4 |  |  | — |  |  | — |  |  | 4 |
U.S. mid-cap equity index funds | 6 |  |  | — |  |  | — |  |  | 6 |
Non-U.S. equities growth fund | 15 |  |  | — |  |  | — |  |  | 15 |
U.S. equity funds: |  |  |  |  |  |  |
U.S. mid-cap | 12 |  |  | — |  |  | — |  |  | 12 |
U.S. small-cap | 4 |  |  | — |  |  | — |  |  | 4 |
Other | 4 |  |  | — |  |  | — |  |  | 4 |
Fixed income securities: |  |  |  |  |  |  |
U.S. Treasury bonds | 18 |  |  | — |  |  | — |  |  | 18 |
U.S. government agencies | — |  |  | 26 |  |  | — |  |  | 26 |
Fixed income mutual funds: |  |  |  |  |  |  |
U.S. investment-grade fixed income securities | 22 |  |  | — |  |  | — |  |  | 22 |
Total | $ | 158 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 184 |

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