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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Millions | Mar. 01, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of financial assets [line items] |  |  |  |
Assets |  |  | $ 69,329 | $ 66,764
Liabilities |  |  | $ (46,814) | (43,823)
Repurchase obligation of trust ownership percentage |  |  | 9.00% |
MLSE financial liability |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Liabilities |  |  | $ (149) | (149)
MLSE financial liability | Repurchased obligation |  |  |  |
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 | 0
MLSE financial liability | OBSERVABLE MARKET DATA (LEVEL 2) |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Liabilities |  |  | 0 | 0
MLSE financial liability | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Liabilities |  |  | (149) | (149)
Publicly-traded and privately-held investments |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Assets |  |  | 215 | 183
Publicly-traded and privately-held investments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Assets |  |  | 9 | 24
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 |  |  | 206 | 159
Derivative financial instruments | Derivative financial instruments |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Assets (liabilities) |  |  | 72 | 279
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) |  |  | 72 | 279
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) |  |  | 108 | 122
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) |  |  | 184 | 185
Other | Other | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Assets (liabilities) |  |  | $ (76) | $ (63)

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