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EMPLOYEE BENEFITS - Postretirement Benefits (Details) - Postretirement Benefits - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Postretirement Benefits |  |  |
Service cost | $ 2 | $ 4 | $ 5
Interest cost | 5 | 4 | 3
Expected return on assets | (6) | (8) | (8)
Amortization of prior service credits | (10) | (10) | (9)
Amortization of unrecognized gains | (7) | (9) | (8)
Net periodic (benefits) costs | (16) | (19) | (17)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 112 | 153 |
Service cost | 2 | 4 | 5
Interest cost | 5 | 4 | 3
Plan participants' contributions | 3 | 3 |
Actuarial loss (gains) | 2 | (40) |
Benefits paid | (10) | (12) |
Benefit obligation at end of year | 114 | 112 | 153
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets available for benefits at beginning of year | 162 | 207 |
Actual returns on plan assets | 18 | (36) |
Plan participants' contributions | 3 | 3 |
Benefits paid | (10) | (12) |
Plan assets available for benefits at end of year | 173 | 162 | $ 207
Noncurrent postretirement benefit asset | 59 | 50 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Prior service credit | 23 | 33 |
Unrecognized gains | 79 | 77 |
Deferred tax liability | (25) | (28) |
Net accumulated gains | $ 77 | $ 82 |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount rate | 4.92% | 2.57% | 2.17%
Long-term rate of return on plan assets – net of tax | 4.04% | 4.04% | 4.04%
Pre age 65 | 7.50% | 6.50% | 5.81%
Ultimate healthcare cost trend rate | 4.50% | 4.50% | 4.50%
Year ultimate healthcare cost trend rate reached | 2033 | 2030 | 2026
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Discount rate | 4.73% | 4.92% | 2.57%
Expected long-term rate of return on plan assets – net of tax | 4.04% | 4.04% | 4.04%
Pre age 65 | 7.20% | 7.50% | 6.50%
Year ultimate healthcare cost trend rate reached | 2033 | 2033 | 2030
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract] |  |  |
2024 | $ 9 |  |
2025 | 10 |  |
2026 | 10 |  |
2027 | 9 |  |
2028 | 8 |  |
2029-2033 | 41 |  |
Total | $ 87 |  |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the next year used to determine benefit obligations. This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -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 (h)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. 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/2009/role/commonPracticeRef -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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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