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ACQUISITION AND DISPOSITIONS - OTHER DISPOSITIONS (Details)
CAD in Millions, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2016
CAD
Aug. 31, 2015
USD ($)
Aug. 31, 2015
CAD
May 31, 2015
CAD
Nov. 30, 2014
USD ($)
Nov. 30, 2014
CAD
Jul. 31, 2014
USD ($)
Jul. 31, 2014
CAD
Mar. 31, 2014
CAD
Dec. 31, 2016
CAD
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
OTHER DISPOSITIONS                        
Gain on sale                   CAD 848 CAD 94 CAD 38
Other miscellaneous non-core assets | Disposed of by sale, not discontinued operations                        
OTHER DISPOSITIONS                        
Cash proceeds from sale of assets CAD 286                      
Frontier Pipeline Company | Disposed of by sale, not discontinued operations                        
OTHER DISPOSITIONS                        
Ownership percent sold   77.80% 77.80%                  
Cash proceeds from sale of assets   $ 85 CAD 112                  
Gain on sale   $ 53 CAD 70                  
Certain crude oil pipeline system assets | Disposed of by sale, not discontinued operations                        
OTHER DISPOSITIONS                        
Cash proceeds from sale of assets       CAD 26                
Gain on sale       CAD 22                
Non-core assets within Enbridge Offshore Pipelines | Disposed of by sale, not discontinued operations                        
OTHER DISPOSITIONS                        
Cash proceeds from sale of assets         $ 7 CAD 7            
Gain on sale         $ 19 CAD 22            
Southern Access Extension Project | Disposed of by sale, not discontinued operations                        
OTHER DISPOSITIONS                        
Ownership percentage sold             35.00% 35.00%        
Cash proceeds from sale of assets             $ 68 CAD 73        
Gain on sale               CAD 0        
Alternative and Emerging Technologies | Disposed of by sale, not discontinued operations                        
OTHER DISPOSITIONS                        
Cash proceeds from sale of assets                 CAD 19      
Gain on sale                 CAD 16