INCOME TAXES - COMPONENTS OF TAX EXPENSE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current tax expense (benefit):
Federal	$ 26	$ (5)	$ 127
State	13	9	35
Total current	39	4	162
Deferred tax expense:
Federal	175	125	(3)
State	33	19	40
Total deferred	208	144	37
Income tax expense	$ 247	$ 148	$ 199