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EMPLOYEE BENEFIT PLANS - Obligations and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Retirement Pension Benefits    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]    
Beginning balance $ 423 $ 567
Service cost 7 7
Interest cost 27 18
Plan participants’ contributions 0 0
Actuarial (gain) loss 38 (149)
Benefits paid (33) (20)
Magellan Acquisition 240 0
Ending balance 702 423
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning balance 322 413
Actual return on plan assets 60 (71)
Plan participants’ contributions 0 0
Benefits paid (33) (20)
Magellan Acquisition 205 0
Ending balance 554 322
Funded (unfunded) status of plan (148) (101)
Current liabilities (5) (5)
Noncurrent liabilities (143) (96)
Balance at December 31 (148) (101)
Other Postretirement Benefits Plan    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]    
Beginning balance 38 51
Service cost 0 0
Interest cost 2 1
Plan participants’ contributions 1 1
Actuarial (gain) loss 3 (11)
Benefits paid (4) (4)
Magellan Acquisition 11 0
Ending balance 51 38
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning balance 17 24
Actual return on plan assets 2 (4)
Plan participants’ contributions 1 1
Benefits paid (4) (4)
Magellan Acquisition 0 0
Ending balance 16 17
Funded (unfunded) status of plan (35) (21)
Current liabilities 0 0
Noncurrent liabilities (35) (21)
Balance at December 31 (35) (21)
Supplemental Executive Retirement Plan Investments Included in Other Assets[Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at December 31 $ 89 $ 92