PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Assets Within Our Nonregisted Pension Plans (Details) (Non Registered Canadian Pension Plans)	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	100.00%	100.00%
Equities
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	55.50%	43.50%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	44.50%	56.50%