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Interest and Other Financing Expense (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Borrowing costs [abstract]      
Long-term debt $ 610,000,000 $ 681,000,000 $ 785,000,000
Lease liabilities 60,000,000 62,000,000 67,000,000
Less: amounts capitalized on qualifying assets 0 0 (24,000,000)
Total interest and other financing expense 670,000,000 743,000,000 828,000,000
Total interest income and other (121,000,000) (32,000,000) (72,000,000)
Net interest and other financing expense $ 549,000,000 $ 711,000,000 $ 756,000,000