POSTRETIREMENT BENEFIT PLANS - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026 USD ($) category	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) category	Jun. 30, 2025 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of categories \| category	3		3
Defined contribution plan costs	$ 67	$ 59	$ 164	$ 139
Principal retiree benefit
Defined Benefit Plan Disclosure [Line Items]
Plans expense (income)	$ (13)	$ (17)	$ (26)	$ (32)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details