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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of financial assets [line items] |  |
Assets | $ 71,940 | $ 69,329
Liabilities | $ 51,383 | 46,814
Repurchase obligation of trust ownership percentage | 9.00% |
MLSE financial liability |  |
Disclosure of financial assets [line items] |  |
Liabilities | $ 149 | 149
MLSE financial liability | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |
Disclosure of financial assets [line items] |  |
Liabilities |  | 0
MLSE financial liability | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Liabilities |  | 0
MLSE financial liability | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Liabilities |  | 149
Publicly-traded and privately-held investments |  |
Disclosure of financial assets [line items] |  |
Assets | 587 | 215
Publicly-traded and privately-held investments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |
Disclosure of financial assets [line items] |  |
Assets | 10 | 9
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 | 577 | 206
Derivative financial instruments | Derivative financial instruments |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | (488) | 72
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) | (488) | 72
Derivative financial instruments | Derivative financial instruments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 0 | 0
Other | Other |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 147 | 108
Other | Other | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 0 | 0
Other | Other | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 216 | 184
Other | Other | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | $ (69) | $ (76)

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