INCOME TAXES - Schedule of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current (benefits) provision for income taxes:
Federal	$ (89)	$ 59	$ 77
State	(2)	8	7
Current income tax expense (benefit)	(91)	67	84
Deferred (benefit) provision for income taxes:
Federal	(4)	(69)	(196)
State	(1)	(34)	37
Deferred income tax expense (benefit)	(5)	(103)	(159)
(Benefit) provision for income taxes	$ (96)	$ (36)	$ (75)