INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance	$ (1)	$ 3
Valuation allowance for deferred tax assets	65	$ 66
Reduction of unrecognized tax benefits reasonably possible	4
Federal
Operating Loss Carryforwards [Line Items]
Gross net operating losses	106
State
Operating Loss Carryforwards [Line Items]
Gross net operating losses	$ 1,900