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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Disclosure of financial assets [line items] |  |
Assets | $ 80,165 | $ 73,485
Publicly-traded and privately-held investments |  |
Disclosure of financial assets [line items] |  |
Assets | 1,198 | 877
Publicly-traded and privately-held investments | Quoted prices in active markets for identical assets (level 1) |  |
Disclosure of financial assets [line items] |  |
Assets | 105 | 35
Publicly-traded and privately-held investments | Observable market data (level 2) |  |
Disclosure of financial assets [line items] |  |
Assets | 0 | 0
Publicly-traded and privately-held investments | Non-observable market inputs (level 3) |  |
Disclosure of financial assets [line items] |  |
Assets | 1,093 | 842
Derivative financial instruments | Derivative financial instruments |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | (513) | (368)
Derivative financial instruments | Derivative financial instruments | Quoted prices in active markets for identical assets (level 1) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 0 | 0
Derivative financial instruments | Derivative financial instruments | Observable market data (level 2) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | (513) | (368)
Derivative financial instruments | Derivative financial instruments | Non-observable market inputs (level 3) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 0 | 0
Investments |  |
Disclosure of financial assets [line items] |  |
Assets | 246 | 225
Investments | Quoted prices in active markets for identical assets (level 1) |  |
Disclosure of financial assets [line items] |  |
Assets | 0 | 0
Investments | Observable market data (level 2) |  |
Disclosure of financial assets [line items] |  |
Assets | 246 | 225
Investments | Non-observable market inputs (level 3) |  |
Disclosure of financial assets [line items] |  |
Assets | $ 0 | $ 0

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