BENEFIT PLANS - WEIGHTED AVERAGE ASSUMPTIONS USED TO DETERMINE BENEFIT OBLIGATIONS (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	1.60%	2.10%	1.80%
Rate of compensation increase	2.60%	2.50%	2.60%
Other Postemployment Benefits
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	4.40%	4.70%	4.30%
Health care cost trend pre 65	7.80%	7.60%	8.00%
Health care cost trend post 65	8.50%	8.20%	7.00%
Ultimate health care cost trend	4.50%	5.00%	5.00%
Years until trend is reached pre 65	9 years	9 years	8 years
Years until ultimate trend is reached post 65	9 years	9 years	7 years