PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Pension
Estimated Future Benefit Payments
2024	$ 554
2025	562
2026	564
2027	569
2028	571
Years 2029-2033	2,877
OPEB
Estimated Future Benefit Payments
2024	49
2025	41
2026	40
2027	39
2028	37
Years 2029-2033	164
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt [Abstract]
2024	(1)
2025	(1)
2026	0
2027	0
2028	0
Years 2029-2033	$ (2)

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of prescription drug subsidy receipt expected after fifth fiscal year following current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
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-URI https://asc.fasb.org//1943274/2147480266/715-60-50-4

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