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financial instruments - Significant unobservable inputs used in the fair value measurement (Details) - CAD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025 | Dec. 31, 2024
Disclosure of fair value measurement of assets |  |  |  |
Balance of period | $ 56,812 |  | $ 59,613 |
Virtual power purchase agreements unrealized change in forward element | At fair value |  |  |  |
Disclosure of fair value measurement of assets |  |  |  |
Included in net income, excluding income taxes | 3 | $ 2 |  |
Included in other comprehensive income, excluding income taxes | (21) | 17 |  |
Balance of period | $ (46) | $ (19) | $ (28) | $ (38)

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