EMPLOYEE BENEFIT PLANS (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 13	$ 12	$ 12
Interest Cost	15	15	17
Expected Return on Plan Assets	(25)	(23)	(23)
Amortization of Net Loss	8	7	7
Net Periodic Benefit Cost	11	11	13
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service Cost	4	4	4
Interest Cost	2	2	3
Expected Return on Plan Assets	(1)	(1)	(1)
Amortization of Net Loss	0	0	0
Net Periodic Benefit Cost	$ 5	$ 5	$ 6