PENSION AND OTHER POSTRETIREMENT BENEFITS - Accumulated Other Comprehensive (Income) Loss Associated With Other Postretirement Benefit Plans (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension ongoing income—non-service \| U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	$ (7)	$ (50)
Net actuarial (gain) loss	1,191	814
Net amount recognized	1,184	764
Pension ongoing income—non-service \| Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	18	18
Net actuarial (gain) loss	422	360
Net amount recognized	440	378
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	(30)	(50)
Net actuarial (gain) loss	(68)	(84)
Net amount recognized	$ (98)	$ (134)

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
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A

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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- Definition

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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- Definition

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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