INCOME TAXES - Schedule of Income Tax Uncertainties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 46	$ 22	$ 9
Additions related to current year	2	16	3
Additions related to prior years	0	1	2
Transfer To/From Former Parent	0	7	8
Balance at end of year	$ 46	$ 46	$ 22