PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2022 USD ($)
Pension
Estimated Future Benefit Payments
2023	$ 583
2024	587
2025	597
2026	605
2027	612
Years 2028-2031	3,120
OPEB
Estimated Future Benefit Payments
2023	44
2024	42
2025	40
2026	39
2027	37
Years 2028-2031	167
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt [Abstract]
2023	(1)
2024	(1)
2025	(1)
2026	0
2027	0
Years 2028-2031	$ (2)

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