INCOME TAXES (Uncertain Tax Positions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning of Period	$ 12	$ 5
Additions Based on Tax Positions Taken in the Current Year	7	7
Reduction to Positions, TCJA	(6)	0
End of Period	$ 13	$ 12