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GOODWILL (Details) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gross Cost      
Goodwill, gross at beginning of period CAD 538 CAD 540  
Foreign exchange and other (1,180) (2)  
Acquired in Merger Transaction (Note 7) 36,656    
Sabal Trail deconsolidation (Note 12) (966)    
Disposition (29)    
Goodwill, gross at end of period 35,019 538 CAD 540
Accumulated Impairment      
Goodwill, impaired, accumulated impairment loss at beginning of period (460) (460)  
Impairment (102) 0 (440)
Goodwill, impaired, accumulated impairment loss at end of period (562) (460) (460)
Goodwill 34,457 78  
Consolidation, Eliminations      
Gross Cost      
Goodwill, gross at beginning of period 13 13  
Foreign exchange and other 0 0  
Acquired in Merger Transaction (Note 7) 0    
Disposition 0    
Goodwill, gross at end of period 13 13 13
Accumulated Impairment      
Goodwill, impaired, accumulated impairment loss at beginning of period (13) (13)  
Impairment 0 0  
Goodwill, impaired, accumulated impairment loss at end of period (13) (13) (13)
Goodwill 0 0  
Liquids Pipelines      
Gross Cost      
Goodwill, gross at beginning of period 59 60  
Foreign exchange and other (314) (1)  
Acquired in Merger Transaction (Note 7) 8,070    
Sabal Trail deconsolidation (Note 12) 0    
Disposition (29)    
Goodwill, gross at end of period 7,786 59 60
Accumulated Impairment      
Goodwill, impaired, accumulated impairment loss at beginning of period 0 0  
Impairment 0 0  
Goodwill, impaired, accumulated impairment loss at end of period 0 0 0
Goodwill 7,786 59  
Gas Transmission & Midstream      
Gross Cost      
Goodwill, gross at beginning of period 457 458  
Foreign exchange and other (866) (1)  
Acquired in Merger Transaction (Note 7) 22,914    
Sabal Trail deconsolidation (Note 12) (966)    
Disposition 0    
Goodwill, gross at end of period 21,539 457 458
Accumulated Impairment      
Goodwill, impaired, accumulated impairment loss at beginning of period (440) (440)  
Impairment (102) 0  
Goodwill, impaired, accumulated impairment loss at end of period (542) (440) (440)
Goodwill 20,997 17  
Gas Distribution      
Gross Cost      
Goodwill, gross at beginning of period 7 7  
Foreign exchange and other 0 0  
Acquired in Merger Transaction (Note 7) 5,672    
Disposition 0    
Goodwill, gross at end of period 5,679 7 7
Accumulated Impairment      
Goodwill, impaired, accumulated impairment loss at beginning of period (7) (7)  
Impairment 0 0  
Goodwill, impaired, accumulated impairment loss at end of period (7) (7) (7)
Goodwill 5,672 0  
Green Power and Transmission      
Gross Cost      
Goodwill, gross at beginning of period 0 0  
Foreign exchange and other 0 0  
Acquired in Merger Transaction (Note 7) 0    
Disposition 0    
Goodwill, gross at end of period 0 0 0
Accumulated Impairment      
Goodwill, impaired, accumulated impairment loss at beginning of period 0 0  
Impairment 0 0  
Goodwill, impaired, accumulated impairment loss at end of period 0 0 0
Goodwill 0 0  
Energy Services      
Gross Cost      
Goodwill, gross at beginning of period 2 2  
Foreign exchange and other 0 0  
Acquired in Merger Transaction (Note 7) 0    
Disposition 0    
Goodwill, gross at end of period 2 2 2
Accumulated Impairment      
Goodwill, impaired, accumulated impairment loss at beginning of period 0 0  
Impairment 0 0  
Goodwill, impaired, accumulated impairment loss at end of period 0 0 CAD 0
Goodwill CAD 2 CAD 2