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GOODWILL - Narrative (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Aug. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Goodwill recorded on Company's acquisitions in the U.S.          
Goodwill $ 14,178 $ 12,887      
Midstream          
Goodwill recorded on Company's acquisitions in the U.S.          
Goodwill       $ 595  
Tuscarora          
Goodwill recorded on Company's acquisitions in the U.S.          
Goodwill     $ 82   $ 82
Goodwill impairment charge 79        
Goodwill impairment charge, net of tax and noncontrolling interest $ 15        
Goodwill accumulated impairment loss     $ 59   $ 59