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Share repurchases (Tables)
 9 Months Ended
Sep. 30, 2025
Stockholders' Equity Note [Abstract]  
Schedule of Share Repurchase Program
The following table provides activities under the share repurchase program:

For the three months ended September 30For the nine months ended September 30
20252025
Number of Common Shares repurchased(1)
17,726,29634,089,408 
Weighted-average price per share(2)
$106.74$107.51
Amount of repurchase (in millions of Canadian dollars)(1)(2)
$1,892$3,665
(1) Includes shares repurchased but not yet cancelled at end of period.
(2) Includes brokerage fees and applicable tax on share repurchases.