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Other expense - Schedule of Other Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Analysis of income and expense [abstract]    
Net mark-to-market losses on derivatives used to economically hedge equity settled share-based compensation plans $ (269) $ (103)
Equity (losses) income from investments in associates and joint ventures    
Loss on investment (247) (581)
Operations 10 28
(Losses) gains on retirements and disposals of property, plant and equipment and intangible assets (38) 11
Interest income 123 67
Gains on investments 57 80
Early debt redemption costs 0 (1)
Other 59 33
Total other expense $ (305) $ (466)