INCOME TAXES (Uncertain Tax Position) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	$ 206
Reconciliation of Total Gross Unrecognized Tax Benefits [Roll Forward]
Gross unrecognized tax benefits, beginning balance		$ 1	$ 68	$ 1
Increases related to positions taken on items from prior years		0	139	67
Settlement of uncertain tax positions with tax authorities	(67)	0	(206)	0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1	1	1	1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		(6)	(36)	37
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0	0	38
Gross unrecognized tax benefits, ending balance	$ 1	$ 1	$ 1	$ 68