INCOME TAXES (Uncertain Tax Position) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Total Gross Unrecognized Tax Benefits [Roll Forward]
Gross unrecognized tax benefits, beginning balance		$ 1		$ 1	$ 1	$ 68
Increases related to positions taken on items from prior years				0	0	139
Settlement of uncertain tax positions with tax authorities			$ (67)	0	0	(206)
Gross unrecognized tax benefits, ending balance			1	1	1	1
Total unrecognized tax benefits that, if recognized, would impact the effective tax rate			1	1	1	1
Total amount of interest and penalties (benefit) recognized in Provision (Credit) for income taxes				$ (5)	$ (6)	$ (36)
Tax Adjustments, Settlements, and Unusual Provisions			$ 206
Foreign Tax Authority [Member]
Reconciliation of Total Gross Unrecognized Tax Benefits [Roll Forward]
Increase (Decrease) in Income Taxes Payable	$ 40	$ 40