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INTEREST AND OTHER FINANCING EXPENSE (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Borrowing costs [abstract]      
Long-term debt $ 867 $ 810 $ 664
Less: amounts capitalized on qualifying assets 69 82 233
Total interest and other financing expense 798 728 431
Total interest income (59) (97) (48)
Net interest and other financing expense $ 739 $ 631 $ 383