PENSION AND POSTRETIREMENT BENEFIT PLANS PENSION AND POSTRETIREMENT BENEFIT PLANS (Postretirement Benefit Plans) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 2,934	$ 6,461
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	255	253
Defined Benefit Plan, Plan Assets, Amount	$ 398	$ 331
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.90%	3.90%