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Financial assets and liabilities - Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Disclosure of financial assets [line items] |  |
Other non-current assets | $ 71,134 | $ 73,485
Publicly-traded and privately-held investments |  |
Disclosure of financial assets [line items] |  |
Other non-current assets | 922 | 877
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 | 69 | 35
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 | 853 | 842
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 | (968) | (368)
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 | (962) | (368)
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 | (6) | 0
Other | Other |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | 236 | 225
Other | Other | 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
Other | Other | 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 | 236 | 225
Other | Other | 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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