PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Discount Rates and Rates of Compensation Increase Used in Estimating Our Pension and Other Postretirement Benefit Obligation (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates, benefit obligation	4.30%	4.50%
United States Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates, benefit obligation	3.70%	4.00%
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates, benefit obligation	3.70%	4.00%
Canadian Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates, benefit obligation	3.60%	3.90%
Pension
Defined Benefit Plan Disclosure [Line Items]
ElectionOfLumpSumOrInstallmentDistributions	60.00%	60.00%
Salaried | Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase, Current Year		2.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase, Following Years		3.50%
Hourly | Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.25%	3.25%
Minimum | Salaried | United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.00%	2.00%
Minimum | Hourly | United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.30%	2.30%
Maximum | Salaried | United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	13.00%	13.00%
Maximum | Hourly | United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	13.00%	13.00%