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Interest and Other Financing Expense (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Borrowing costs [abstract]      
Long-term debt $ 681,000,000 $ 785,000,000 $ 895,000,000
Lease liabilities 62,000,000 67,000,000 70,000,000
Less: amounts capitalized on qualifying assets 0 (24,000,000) (53,000,000)
Total interest and other financing expense 743,000,000 828,000,000 912,000,000
Total interest income and other (32,000,000) (72,000,000) (76,000,000)
Net interest and other financing expense $ 711,000,000 $ 756,000,000 $ 836,000,000