EMPLOYEE BENEFIT PLANS - AMOUNTS RECOGNIZED IN CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Liability, Defined Benefit Plan [Abstract]
Accrued benefit liability-long term	$ 665	$ 571
Qualified Defined Benefit [Member]
Liability, Defined Benefit Plan [Abstract]
Accrued benefit liability-long term	502	412
Plan assets-long term (within Other noncurrent assets)	(51)	(49)
Total liability recognized	451	363
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior service credit	(5)	(6)
Net loss	626	595
Amount recognized in AOCL (pretax)	$ 621	$ 589