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Share repurchases - Schedule of Repurchase Program (Details) - CAD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025
Share Repurchase Program [Line Items] |  |
Amount of repurchase | $ 1,892 | $ 3,665
March 2025 Normal Course Issuer Bid (NCIB) |  |
Share Repurchase Program [Line Items] |  |
Number of Common Shares repurchased (in shares) | 17,726,296 | 34,089,408
Weighted-average price per share (CAD per share) | $ 106.74 | $ 107.51
Amount of repurchase | $ 1,892 | $ 3,665

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