PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Accum Benefit Obligations in Excess) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 31,400	$ 28,300
Accumulated benefit obligations	26,959	25,392
Fair value of plan assets	$ 19,571	$ 18,902