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EMPLOYEE BENEFIT PLANS - Obligations and Fair Value of Plan Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Beginning balance | $ 554,000,000 |
Ending balance | 535,000,000 | $ 554,000,000
Retirement Pension Benefits |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |
Beginning balance | 702,000,000 | 423,000,000
Service cost | 21,000,000 | 7,000,000
Interest cost | 37,000,000 | 27,000,000
Plan participants’ contributions | 0 | 0
Actuarial (gain) loss | (35,000,000) | 38,000,000
Benefits paid | (36,000,000) | (33,000,000)
Magellan Acquisition | 0 | 240,000,000
Ending balance | 689,000,000 | 702,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Beginning balance | 554,000,000 | 322,000,000
Actual return on plan assets | 12,000,000 | 60,000,000
Employer contributions | 5,000,000 | 0
Plan participants’ contributions | 0 | 0
Benefits paid | (36,000,000) | (33,000,000)
Magellan Acquisition | 0 | 205,000,000
Ending balance | 535,000,000 | 554,000,000
Balance at Dec. 31 | (154,000,000) | (148,000,000)
Balance at Dec. 31 | (154,000,000) | (148,000,000)
Current liabilities | (5,000,000) | (5,000,000)
Noncurrent liabilities | (149,000,000) | (143,000,000)
Other Postretirement Benefits Plan |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |
Beginning balance | 51,000,000 | 38,000,000
Service cost | 0 | 0
Interest cost | 2,000,000 | 2,000,000
Plan participants’ contributions | 1,000,000 | 1,000,000
Actuarial (gain) loss | (5,000,000) | 3,000,000
Benefits paid | (3,000,000) | (4,000,000)
Magellan Acquisition | 0 | 11,000,000
Ending balance | 46,000,000 | 51,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Beginning balance | 16,000,000 | 17,000,000
Actual return on plan assets | 1,000,000 | 2,000,000
Employer contributions | 0 | 0
Plan participants’ contributions | 1,000,000 | 1,000,000
Benefits paid | (3,000,000) | (4,000,000)
Magellan Acquisition | 0 | 0
Ending balance | 15,000,000 | 16,000,000
Balance at Dec. 31 | (31,000,000) | (35,000,000)
Balance at Dec. 31 | (31,000,000) | (35,000,000)
Current liabilities | 0 | 0
Noncurrent liabilities | (31,000,000) | (35,000,000)
Supplemental Executive Retirement Plan Investments Included in Other Assets |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Balance at Dec. 31 | $ 92,000,000 | $ 89,000,000

X
- 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 actuarial present value of benefits attributed to service rendered by employee for defined benefit 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) -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 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 (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase in benefit obligation of defined benefit plan from business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(8) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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