EMPLOYEE BENEFIT PLANS (Change in Projected Benefit Obligation and Plan Assets and Reconciliation of Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plan [Member]
Change in Projected Benefit Obligation
Beginning of Period	$ 394	$ 407
Actuarial (Gain) Loss	20	(22)
Interest Cost	15	17	$ 16
Service Cost	12	12	10
Benefits Paid	(17)	(20)
End of Period	424	394	407
Change in Fair Value of Plan Assets
Beginning of Period	336	335
Actual Return on Plan Assets	27	(3)
Benefits Paid	(17)	(20)
Employer Contributions	8	24
End of Period	354	336	335
Funded Status at End of Period	(70)	(58)
Other Postretirement Benefits [Member]
Change in Projected Benefit Obligation
Beginning of Period	78	81
Actuarial (Gain) Loss	0	(5)
Interest Cost	2	3	3
Service Cost	4	4	4
Benefits Paid	(5)	(5)
End of Period	79	78	81
Change in Fair Value of Plan Assets
Beginning of Period	13	12
Actual Return on Plan Assets	1	0
Benefits Paid	(5)	(5)
Employer Contributions	5	6
End of Period	14	13	$ 12
Funded Status at End of Period	$ (65)	$ (65)