PENSION AND OTHER POSTRETIREMENT BENEFITS (Estimated Future Benefit Payments) $ in Millions	Dec. 31, 2020 USD ($)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 287
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	263
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	260
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	257
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	254
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	1,190
Total estimated future benefit payments	2,511
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	15
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	15
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	15
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	16
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	16
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	73
Total estimated future benefit payments	$ 150