PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Defined Benefit Pension Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Pension contributions	$ 162
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected Pension Contributions	$ 42
Discount rate - benefit obligations	3.59%	4.00%
Discount rate - net periodic costs	4.00%	4.26%	3.90%
Rate of Compensation Increase benefit obligations	4.25%	4.25%
Rate of Compensation Increase - net periodic costs	4.25%	4.50%	4.50%
Expected Return on Plan Assets - net periodic costs	6.80%	6.80%	6.80%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate - benefit obligations	3.51%	3.88%
Discount rate - net periodic costs	3.88%	4.08%	3.75%