POSTRETIREMENT BENEFIT PLANS - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($) category	Mar. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of categories \| category	3
Defined contribution plan costs	$ 89	$ 77
Deferred compensation expense	9	20
Principal retiree benefit
Defined Benefit Plan Disclosure [Line Items]
Plans income	36	36
Other pension
Defined Benefit Plan Disclosure [Line Items]
Plans income	$ 13	$ 29

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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