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Interest and Other Financing Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Borrowing costs [abstract]      
Long-term debt $ 785 $ 895 $ 867
Interest expense on lease liabilities 67 70  
Less: amounts capitalized on qualifying assets (24) (53) (69)
Total interest and other financing expense 828 912 798
Total interest income (72) (76) (59)
Net interest and other financing expense $ 756 $ 836 $ 739