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PENSION AND POSTRETIREMENT BENEFIT PLANS - Narrative (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) employee | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 31, 2024 age | Jul. 01, 2024 USD ($) plan | Jun. 30, 2024 plan
Defined Benefit Plan Disclosure |  |  |  |  |  |
Defined benefit plan, number of plans | plan |  |  |  |  |  | 2
Defined benefit plans, postretirement benefits, number of plans acquired | plan |  |  |  |  | 2 |
Defined benefit plan, age threshold for retirement benefits | age |  |  |  | 65 |  |
Curtailment loss | $ 4 |  |  |  |  |
Net periodic benefit costs | 4 |  |  |  |  |
Other long-term liabilities for the supplemental retirement plan | 30 | $ 24 |  |  |  |
Expenses under provisions of defined contribution and supplemental plans | $ 27 | $ 19 | $ 18 |  |  |
Equity Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Target allocation of plan assets | 45.00% | 50.00% |  |  |  |
Debt Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Target allocation of plan assets | 55.00% | 50.00% |  |  |  |
Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Other assets | $ 67 | $ 2 |  |  | $ 64 |
Liability, defined benefit pension plan |  |  |  |  | 8 |
Net periodic benefit costs | $ (2) | 0 | 1 |  |  |
Number of employees accruing benefits under defined benefit plans | employee | 800 |  |  |  |  |
Expected contribution in 2024 | $ 1 |  |  |  |  |
Fair value of plan assets | $ 332 | 34 | 32 |  |  |
Pension Benefits | Aera |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Number of employees accruing benefits under defined benefit plans | employee | 60 |  |  |  |  |
Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Other assets | $ 13 | 0 |  |  | 9 |
Liability, defined benefit pension plan |  |  |  |  | $ 27 |
Curtailment loss | 4 | 3 | 0 |  |  |
Net periodic benefit costs | $ (2) | $ (6) | (2) |  |  |
Defined benefit plan, health care cost trend rate consumer price index | 2.45% | 2.38% |  |  |  |
Expected contribution in 2024 | $ 7 |  |  |  |  |
Fair value of plan assets | $ 54 | $ 1 | $ 1 |  |  |
Postretirement Benefits | Equity Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Target allocation of plan assets |  | 40.00% |  |  |  |
Postretirement Benefits | Debt Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Target allocation of plan assets |  | 60.00% |  |  |  |
Postretirement Benefits | Mutual funds |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Fair value of plan assets |  | $ 1 |  |  |  |
Postretirement Benefits | Union employees |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Projected healthcare cost rate in ninth year after current fiscal year | 4.50% |  |  |  |  |
Projected healthcare cost rate in tenth year and thereafter | 4.50% |  |  |  |  |
Projected healthcare cost rate in tenth year after current fiscal year |  | 4.50% |  |  |  |
Projected healthcare cost rate in eleventh year and thereafter |  | 4.50% |  |  |  |
Postretirement Benefits | Minimum | Union employees |  |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |  |
Projected healthcare cost rate in next fiscal year | 6.50% | 6.75% |  |  |  |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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