PENSION AND POSTRETIREMENT BENEFIT PLANS PENSION AND POSTRETIREMENT BENEFIT PLANS (Postretirement Benefit Plans) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 6,461	$ 7,114
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	253	298
Defined Benefit Plan, Plan Assets, Amount	$ 331	$ 364
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.90%	3.30%