PENSION AND OTHER POSTEMPLOYMENT BENEFITS - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Pension Benefit Payments
Estimated Future Benefit Payments
2025	$ 1,150
2026	514
2027	519
2028	524
2029	528
Years 2030-2034	2,652
OPEB
Estimated Future Benefit Payments
2025	43
2026	42
2027	41
2028	39
2029	37
Years 2030-2034	163
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt [Abstract]
2025	0
2026	(1)
2027	0
2028	(1)
2029	0
Years 2030-2034	$ (3)

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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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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Amount of prescription drug subsidy receipt expected in next fiscal year following current fiscal year.

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