EMPLOYEE BENEFITS - Schedule of Long-term Rates of Return on Pension and PBOP (Details)	12 Months Ended
	Dec. 31, 2016
United States [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	22.00%
Assumed Rate of Return	8.50%
International [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	13.00%
Assumed Rate of Return	8.50%
Emergining Markets [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	5.00%
Assumed Rate of Return	10.00%
Private Equity [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	12.00%
Assumed Rate of Return	12.00%
Fixed Income [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	12.00%
Assumed Rate of Return	4.50%
High Yield Fixed Income [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	13.00%
Assumed Rate of Return	8.50%
Emerging Markets Debt [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	5.00%
Assumed Rate of Return	7.50%
Real Estate [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	10.00%
Assumed Rate of Return	7.50%
Hedge Funds [Member]
Defined Contribution Plan Disclosure [Line Items]
Target Asset Allocation	8.00%
Assumed Rate of Return	7.00%