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RETIREMENT PLANS - Schedule of Accumulated Benefit Obligation, Change in Benefit Obligation, Change in Plan Assets, Plans' Funded Status and Amount Included in Consolidated Balance Sheets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Benefit Obligation |  |  |
Accumulated benefit obligation | $ 120 | $ 122 |
Projected benefit obligation at beginning of year | 122 | 131 |
Interest cost | 6 | 6 | $ 7
Actuarial loss (gain) | 4 | (4) |
Benefits paid | (12) | (11) |
Projected benefit obligation at end of year | 120 | 122 | 131
Fair Value of Plan Assets |  |  |
Fair value of plan assets at beginning of year | 184 | 178 |
Actual return on plan assets | 20 | 15 |
Corporation contribution | 3 | 2 |
Benefits paid | (12) | (11) |
Fair value of plan assets at end of year | 195 | 184 | 178
Funded status of plans | 75 | 62 |
Qualified Pension Plans |  |  |
Benefit Obligation |  |  |
Accumulated benefit obligation | 107 | 108 |
Projected benefit obligation at beginning of year | 108 | 116 |
Interest cost | 5 | 5 |
Actuarial loss (gain) | 3 | (4) |
Benefits paid | (9) | (9) |
Projected benefit obligation at end of year | 107 | 108 | 116
Fair Value of Plan Assets |  |  |
Fair value of plan assets at beginning of year | 184 | 178 |
Actual return on plan assets | 20 | 15 |
Corporation contribution | 0 | 0 |
Benefits paid | (9) | (9) |
Fair value of plan assets at end of year | 195 | 184 | 178
Funded status of plans | 88 | 76 |
Non Qualified Pension Plans |  |  |
Benefit Obligation |  |  |
Accumulated benefit obligation | 13 | 14 |
Projected benefit obligation at beginning of year | 14 | 15 |
Interest cost | 1 | 1 |
Actuarial loss (gain) | 1 | 0 |
Benefits paid | (3) | (2) |
Projected benefit obligation at end of year | 13 | 14 | 15
Fair Value of Plan Assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Corporation contribution | 3 | 2 |
Benefits paid | (3) | (2) |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Funded status of plans | $ (13) | $ (14) |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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