PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Summary of Pre-Tax losses Included in AOCI (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension benefits
Summary of the pre-tax losses included in AOCI
Actuarial loss (gain)	$ 626	$ 513
Prior service credit and transition obligation	11	8
Total pre-tax loss (gain) recognized in AOCI	637	521
OPEB
Summary of the pre-tax losses included in AOCI
Actuarial loss (gain)	(50)	(69)
Prior service credit and transition obligation	(16)	(27)
Total pre-tax loss (gain) recognized in AOCI	$ (66)	$ (96)

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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