v3.25.4
Earnings per Share (Details) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation between basic and diluted earnings per share:      
Net income $ 4,720 $ 4,448 $ 5,625
Weighted-average basic shares outstanding (in shares) 623.1 633.5 657.7
Dilutive effect of stock-based compensation (in shares) 0.6 1.0 1.4
Weighted-average diluted shares outstanding (in shares) 623.7 634.5 659.1
Basic earnings per share (in dollars per share) $ 7.58 $ 7.02 $ 8.55
Diluted earnings per share (in dollars per share) $ 7.57 $ 7.01 $ 8.53
Stock options      
Units excluded from the calculation as their inclusion would not have a dilutive effect      
Units excluded from the calculation as their inclusion would not have a dilutive effect (in shares) 2.2 1.2 1.0
Performance share units      
Units excluded from the calculation as their inclusion would not have a dilutive effect      
Units excluded from the calculation as their inclusion would not have a dilutive effect (in shares) 0.7 0.4 0.5