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SUBSEQUENT EVENT (Details)
MMcf in Millions, CAD in Millions
12 Months Ended
Jan. 07, 2016
CAD
MMcf
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Subsequent Events      
Cash consideration   CAD 106 CAD 394
Subsequent Event | Tupper Main and Tupper West | Forecast      
Subsequent Events      
Ownership interest acquired (as a percent) 100.00%    
Cash consideration CAD 538    
Processing capacity | MMcf 320