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Consolidated statement of shareholders' equity (U.S GAAP, unaudited) - CAD ($)
$ in Millions
Total
Common shares at stated value (note 9)
Earnings reinvested
Accumulated other comprehensive income (loss) (note 10)
At beginning of period at Dec. 31, 2023   $ 992 $ 21,907 $ (677)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share purchases at stated value   (23)    
Net income (loss) for the period $ 3,565   3,565  
Share purchases in excess of stated value     (1,207)  
Dividends declared     (960)  
Other comprehensive income (loss) 42     42
At end of period at Sep. 30, 2024 23,639 969 23,305 (635)
At beginning of period at Dec. 31, 2023   992 21,907 (677)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share purchases at stated value   (50)    
At end of period at Dec. 31, 2024 23,473 942 22,745 (214)
At beginning of period at Jun. 30, 2024   992 23,592 (648)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share purchases at stated value   (23)    
Net income (loss) for the period 1,237   1,237  
Share purchases in excess of stated value     (1,207)  
Dividends declared     (317)  
Other comprehensive income (loss) 13     13
At end of period at Sep. 30, 2024 23,639 969 23,305 (635)
At beginning of period at Dec. 31, 2024 23,473 942 22,745 (214)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share purchases at stated value   (23)    
Net income (loss) for the period 2,776   2,776  
Share purchases in excess of stated value     (1,475)  
Dividends declared     (1,094)  
Other comprehensive income (loss) 27     27
At end of period at Sep. 30, 2025 23,684 919 22,952 (187)
At beginning of period at Jun. 30, 2025   942 24,249 (192)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share purchases at stated value   (23)    
Net income (loss) for the period 539   539  
Share purchases in excess of stated value     (1,475)  
Dividends declared     (361)  
Other comprehensive income (loss) 5     5
At end of period at Sep. 30, 2025 $ 23,684 $ 919 $ 22,952 $ (187)