PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Other Postretirement Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employer Group Waiver Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in net periodic benefit costs in next twelve months		$ 25
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate - benefit obligations	3.97%	3.68%	4.37%
Initial health care cost trend rate - benefit obligations	7.25%	7.06%	7.45%
Ultimate health care cost trend rate - benefit obligations	5.00%	5.00%	5.00%
Year ultimate trend rate to be reached - benefit obligations	2025	2020	2020
Discount rate - net periodic costs	3.68%	4.37%	3.67%
Initial health care cost trend rate - net periodic costs	7.06%	7.45%	7.84%
Ultimate health care cost trend rate - net periodic costs	5.00%	5.00%	5.00%
Year ultimate trend rate to be reached - net periodic costs	2025	2020	2020
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	$ 16
Defined Benefit Plan, Effect of One Percentage Point Increase On Net Periodic Postretirement Benefit Cost	1
Defined benefit plan effect of one percentage point decrease on accumulated postretirement benefit obligation	22
Defined benefit plan effect of one percentage point decrease on net periodic postretirement benefit cost	$ 1