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Financial assets and liabilities - Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Disclosure of financial assets [line items] |  |
Other non-current assets | $ 81,042 | $ 80,165
Publicly-traded and privately-held investments |  |
Disclosure of financial assets [line items] |  |
Other non-current assets | 352 | 1,198
Publicly-traded and privately-held investments | Quoted prices in active markets for identical assets (level 1) |  |
Disclosure of financial assets [line items] |  |
Other non-current assets | 184 | 105
Publicly-traded and privately-held investments | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Other non-current assets | 0 | 0
Publicly-traded and privately-held investments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Other non-current assets | 168 | 1,093
Derivative financial instruments | Derivative financial instruments |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | (268) | (513)
Derivative financial instruments | Derivative financial instruments | Quoted prices in active markets for identical assets (level 1) |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | 0 | 0
Derivative financial instruments | Derivative financial instruments | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | (268) | (513)
Derivative financial instruments | Derivative financial instruments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | 0 | 0
Investments | Investments |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | 247 | 246
Investments | Investments | Quoted prices in active markets for identical assets (level 1) |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | 0 | 0
Investments | Investments | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | 247 | 246
Investments | Investments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | $ 0 | $ 0

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