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Other (expense) income - Schedule of Other Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]    
Losses on retirements and disposals of property, plant and equipment and intangible assets $ (83) $ (9)
Net mark-to-market (losses) gains on derivatives used to economically hedge equity settled share-based compensation plans (51) 138
Early debt redemption costs (50) (18)
Equity gains (losses) from investments in associates and joint ventures    
Gain (loss) on investment 43 (53)
Operations (38) (19)
Gains on investments 3 18
Other (18) 38
Total other (expense) income $ (194) $ 95