EMPLOYEE BENEFIT PLANS (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension Benefits
Components of Net Periodic Benefit Plan Cost
Service Cost	$ 4	$ 3	$ 11	$ 9
Interest Cost	4	3	12	11
Expected Return on Plan Assets	(7)	(6)	(21)	(18)
Amortization of Net Loss	1	2	5	6
Net Periodic Benefit Cost	2	2	7	8
Other Postretirement Benefits
Components of Net Periodic Benefit Plan Cost
Service Cost	1	1	3	3
Interest Cost	1	1	2	2
Expected Return on Plan Assets	(1)	(1)	(1)	(1)
Amortization of Net Loss	0	0	0	0
Net Periodic Benefit Cost	$ 1	$ 1	$ 4	$ 4