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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