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NON-CONTROLLING INTERESTS (Details) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Non-controlling interest included in the Consolidated Balance Sheet        
Non-controlling interest CAD 1,726 CAD 1,717    
Non-controlling interests included in the Consolidated Statement of Income        
Non-controlling interest 252 6 CAD 151  
Noncontrolling Interest        
Non-controlling interest included in the Consolidated Balance Sheet        
Non-controlling interest 1,726 1,717 1,583 CAD 1,417
Noncontrolling Interest | TC PipeLines, LP        
Non-controlling interest included in the Consolidated Balance Sheet        
Non-controlling interest 1,596 1,590    
Non-controlling interests included in the Consolidated Statement of Income        
Non-controlling interest 215 (13) 136  
Noncontrolling Interest | Non-controlling interest in Columbia Pipeline Partners LP        
Non-controlling interests included in the Consolidated Statement of Income        
Non-controlling interest 17 0 0  
Noncontrolling Interest | PORTLAND NATURAL GAS TRANSMISSION SYSTEM        
Non-controlling interest included in the Consolidated Balance Sheet        
Non-controlling interest 130 127    
Non-controlling interests included in the Consolidated Statement of Income        
Non-controlling interest CAD 20 CAD 19 CAD 15