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Other (expense) income (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Analysis of income and expense [abstract]          
Net mark-to-market (losses) gains on derivatives used to economically hedge equity settled share-based compensation plans $ (81)   $ 100 $ (6) $ 160
Equity (losses) gains from investments in associates and joint ventures          
Loss on investment (42)   (14) (42) (14)
Operations 12   (2) 3 (15)
Gains on investments 16   0 53 0
Gains (losses) on retirements and disposals of property, plant and equipment and intangible assets 2   (3) (4) (8)
Early debt redemption costs 0 $ (18) 0 (18) (53)
Other (4)   10 10 29
Total other (expense) income $ (97)   $ 91 $ (4) $ 99