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Interest and Other Financing Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Borrowing costs [abstract]      
Long-term debt $ 895 $ 867 $ 810
Interest expense on lease liabilities 70    
Less: amounts capitalized on qualifying assets (53) (69) (82)
Total interest and other financing expense 912 798 728
Total interest income (76) (59) (97)
Net interest and other financing expense $ 836 $ 739 $ 631