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Financial assets and liabilities - Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of financial assets [line items] |  |
Other non-current assets | $ 74,247 | $ 71,940
Publicly-traded and privately-held investments |  |
Disclosure of financial assets [line items] |  |
Other non-current assets | 599 | 587
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 | 19 | 10
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 | 580 | 577
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 | (331) | (488)
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 | (331) | (488)
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
Other | Other |  |
Disclosure of financial assets [line items] |  |
Other current assets, trade payables and other liabilities, other non-current assets and liabilities | 148 | 147
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 | 220 | 216
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 | $ (72) | $ (69)

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