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Share repurchases - Schedule of Repurchase Program (Details) - CAD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2025
Share Repurchase Program [Line Items] |  |
Amount of repurchase | $ 1,398 | $ 1,773
March 2025 Normal Course Issuer Bid (NCIB) |  |
Share Repurchase Program [Line Items] |  |
Number of Common Shares repurchased (in shares) | 12,882,454 | 16,363,112
Weighted-average price per share (CAD per share) | $ 108.52 | $ 108.34
Amount of repurchase | $ 1,398 | $ 1,773

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