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ACCOUNTS PAYABLE AND OTHER (Details)
$ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions
12 Months Ended
Oct. 22, 2019
CAD ($)
$ / shares
Oct. 22, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Jan. 01, 2019
CAD ($)
Feb. 17, 2017
$ / shares
Non-controlling interests              
Trade payables     $ 3,314 $ 3,224      
Regulatory liabilities (Note 11)     696 591      
Fair value of derivative contracts (Note 25)     115 922      
Unredeemed shares of Columbia Pipeline Group, Inc.     0 357      
Other     419 314      
Accounts payable and other     4,544 5,408   $ 5,465  
Payment for unredeemed shares of Columbia Pipeline Group Inc. $ 373 $ 284 $ 373 $ 0 $ 0    
Columbia Pipeline Partners LP | Equity Attributable to Non-Controlling Interests              
Non-controlling interests              
Share price (in dollars per share) | (per share) $ 25.50           $ 17.00