POSTRETIREMENT BENEFIT PLANS - Sensitivities to Key Assumptions (Details) - Principal pension $ in Millions	Dec. 31, 2023 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in principal pension plan cost assuming 25 basis point decrease in discount rate	$ 85
Increase in principal pension benefit obligation assuming 25 basis point decrease in discount rate	905
Increase in principal pension plan cost assuming 50 basis point decrease in expected return on assets	$ 165