EMPLOYEE RETIREMENT PLANS - Postretirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Actuarial (gain) loss	$ (36)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	17
2026	20
2027	25
2028	32
2029	39
Next 5 yrs thereafter	273
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Funded status	(256)	$ (269)
Unrecognized net actuarial gain	(179)	(151)
Unrecognized prior service cost	13	2
Accumulated other comprehensive income	165	149
Consolidated Balance Sheet liability	(257)	(269)
Market Based Cash Balance Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Accumulated Benefit Obligation at beginning of period	0	0
Service cost	31	0
Interest cost	0	0
Benefits paid	0	0
Actuarial (gain) loss	(1)	0
Plan Amendments	0	0
Accumulated Benefit Obligation at end of period	30	0	$ 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	0	0
Actual gain/(loss) on plan assets	0	0
Employer contributions	31	0
Benefits paid	0	0
Fair value of plan assets at end of period	31	0	0
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	1
2026	3
2027	7
2028	12
2029	18
Next 5 yrs thereafter	147
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	11
Interest cost	0	0
Amortization of net gain	0
Net periodic postretirement benefit cost	$ 11
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Weighted-average discount rate	5.25%
Weighted average expected long-term rate of return	5.25%
Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Accumulated Benefit Obligation at beginning of period	$ 269	241
Service cost	16	14
Interest cost	14	12	9
Benefits paid	(18)	(9)
Actuarial (gain) loss	(35)	11
Plan Amendments	11	0
Accumulated Benefit Obligation at end of period	257	269	241
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	0	0
Actual gain/(loss) on plan assets	0	0
Employer contributions	20	9
Benefits paid	(20)	(9)
Fair value of plan assets at end of period	0	0	0
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	16
2026	17
2027	18
2028	20
2029	21
Next 5 yrs thereafter	126
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	16	14	19
Interest cost	14	12	9
Amortization of net gain	(7)	(10)	(2)
Net periodic postretirement benefit cost	$ 23	$ 16	$ 26
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Weighted-average discount rate	5.65%	5.20%	5.60%
Assumed healthcare cost trend rate	8.15%	6.25%	6.50%
Ultimate health care cost trend rate	4.50%