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financial instruments - Market risks (Details) - CAD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Interest rate risk    
Market risks    
Percentage of reasonably possible changes in market risk variable 0.25% 0.25%
Net income sensitivity to increase in risk variable $ (3) $ (6)
Other comprehensive income sensitivity to increase in risk variable (14) 4
Comprehensive income sensitivity to increase in risk variable (17) (2)
Net income sensitivity to decrease in risk variable 3 6
Other comprehensive income sensitivity to decrease in risk variable 14 (4)
Comprehensive income sensitivity to decrease in risk variable $ 17 $ 2
Wind discount risk    
Market risks    
Percentage of reasonably possible changes in market risk variable 0.20% 0.20%
Net income sensitivity to increase in risk variable   $ (36)
Other comprehensive income sensitivity to increase in risk variable $ (22)  
Comprehensive income sensitivity to increase in risk variable (22) (36)
Net income sensitivity to decrease in risk variable   36
Other comprehensive income sensitivity to decrease in risk variable 22  
Comprehensive income sensitivity to decrease in risk variable $ 22 $ 36
Solar premium risk    
Market risks    
Percentage of reasonably possible changes in market risk variable 0.20% 0.20%
Net income sensitivity to increase in risk variable   $ 22
Other comprehensive income sensitivity to increase in risk variable $ 12  
Comprehensive income sensitivity to increase in risk variable 12 22
Net income sensitivity to decrease in risk variable   (22)
Other comprehensive income sensitivity to decrease in risk variable (12)  
Comprehensive income sensitivity to decrease in risk variable $ (12) $ (22)
Canadian Dollars | Currency risk    
Market risks    
Percentage of reasonably possible changes in market risk variable 10.00% 10.00%
Net income sensitivity to increase in risk variable $ (6) $ (6)
Other comprehensive income sensitivity to increase in risk variable 47 115
Comprehensive income sensitivity to increase in risk variable 41 109
Net income sensitivity to decrease in risk variable 6 6
Other comprehensive income sensitivity to decrease in risk variable (39) (115)
Comprehensive income sensitivity to decrease in risk variable (33) (109)
Canadian Dollars | Interest rate risk    
Market risks    
Net income sensitivity to increase in risk variable (3) (6)
Other comprehensive income sensitivity to increase in risk variable 72 72
Comprehensive income sensitivity to increase in risk variable 69 66
Net income sensitivity to decrease in risk variable 3 6
Other comprehensive income sensitivity to decrease in risk variable (75) (75)
Comprehensive income sensitivity to decrease in risk variable $ (72) $ (69)
U.S. Dollars | Currency risk    
Market risks    
Percentage of reasonably possible changes in market risk variable 10.00% 10.00%
Net income sensitivity to increase in risk variable $ 14 $ 14
Other comprehensive income sensitivity to increase in risk variable (73) (69)
Comprehensive income sensitivity to increase in risk variable (59) (55)
Net income sensitivity to decrease in risk variable (14) (14)
Other comprehensive income sensitivity to decrease in risk variable 73 69
Comprehensive income sensitivity to decrease in risk variable 59 55
U.S. Dollars | Interest rate risk    
Market risks    
Other comprehensive income sensitivity to increase in risk variable (86) (68)
Comprehensive income sensitivity to increase in risk variable (86) (68)
Other comprehensive income sensitivity to decrease in risk variable 89 71
Comprehensive income sensitivity to decrease in risk variable $ 89 $ 71