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ACQUISITION AND DISPOSITIONS - ASSETS HELD FOR SALE (Details)
CAD in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CAD
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD
ASSETS HELD FOR SALE        
Assets held for sale       CAD 278
Assets of Ozark Pipeline | Liquids Pipelines        
ASSETS HELD FOR SALE        
Assets held for sale     $ 207 CAD 278
Assets of Ozark Pipeline | Liquids Pipelines | Forecast        
ASSETS HELD FOR SALE        
Cash proceeds $ 219 CAD 294    
Reimbursable capital costs included in cash proceeds $ 10 CAD 13