PENSION AND OTHER POSTRETIREMENT BENEFITS (Estimated Future Benefit Payments) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 277
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	276
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	274
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	271
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	268
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	1,264
Total estimated future benefit payments	2,630
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	17
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	16
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	17
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	18
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	18
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	78
Total estimated future benefit payments	$ 164