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financial instruments - Market risks (Details) - CAD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2026 | Jun. 30, 2025
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 | $ (6) | $ (3)
Other comprehensive income sensitivity to increase in risk variable | 4 | (14)
Comprehensive income sensitivity to increase in risk variable | (2) | (17)
Net income sensitivity to decrease in risk variable | 5 | 3
Other comprehensive income sensitivity to decrease in risk variable | (4) | 14
Comprehensive income sensitivity to decrease in risk variable | $ 1 | $ 17
Wind discount risk |  |
Market risks |  |
Percentage of reasonably possible changes in market risk variable | 0.20% | 0.20%
Other comprehensive income sensitivity to increase in risk variable | $ (24) | $ (22)
Comprehensive income sensitivity to increase in risk variable | (24) | (22)
Other comprehensive income sensitivity to decrease in risk variable | 25 | 22
Comprehensive income sensitivity to decrease in risk variable | $ 25 | $ 22
Solar premium risk |  |
Market risks |  |
Percentage of reasonably possible changes in market risk variable | 0.20% | 0.20%
Other comprehensive income sensitivity to increase in risk variable | $ 13 | $ 12
Comprehensive income sensitivity to increase in risk variable | 13 | 12
Other comprehensive income sensitivity to decrease in risk variable | (14) | (12)
Comprehensive income sensitivity to decrease in risk variable | $ (14) | $ (12)
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)
Other comprehensive income sensitivity to increase in risk variable | $ (57) | 47
Comprehensive income sensitivity to increase in risk variable | (57) | 41
Net income sensitivity to decrease in risk variable |  | 6
Other comprehensive income sensitivity to decrease in risk variable | 57 | (39)
Comprehensive income sensitivity to decrease in risk variable | 57 | (33)
Canadian Dollars | Interest rate risk |  |
Market risks |  |
Net income sensitivity to increase in risk variable | (4) | (3)
Other comprehensive income sensitivity to increase in risk variable | 102 | 72
Comprehensive income sensitivity to increase in risk variable | 98 | 69
Net income sensitivity to decrease in risk variable | 4 | 3
Other comprehensive income sensitivity to decrease in risk variable | (106) | (75)
Comprehensive income sensitivity to decrease in risk variable | $ (102) | $ (72)
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 | $ (40) | $ 14
Other comprehensive income sensitivity to increase in risk variable | (13) | (73)
Comprehensive income sensitivity to increase in risk variable | (53) | (59)
Net income sensitivity to decrease in risk variable | 40 | (14)
Other comprehensive income sensitivity to decrease in risk variable | 13 | 73
Comprehensive income sensitivity to decrease in risk variable | 53 | 59
U.S. Dollars | Interest rate risk |  |
Market risks |  |
Net income sensitivity to increase in risk variable | (2) |
Other comprehensive income sensitivity to increase in risk variable | (98) | (86)
Comprehensive income sensitivity to increase in risk variable | (100) | (86)
Net income sensitivity to decrease in risk variable | 1 |
Other comprehensive income sensitivity to decrease in risk variable | 102 | 89
Comprehensive income sensitivity to decrease in risk variable | $ 103 | $ 89

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