PENSION AND POSTRETIREMENT BENEFIT PLANS PENSION AND POSTRETIREMENT BENEFIT PLANS (Accumulated and Projected Benefit Obligation in Excess of Fair Value of Plan Assets) (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	$ 1,652	$ 1,275
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	1,056	817
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	1,417	1,181
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets	$ 875	$ 757