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Assets held for sale (Details) - CAD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 01, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of financial assets [line items] |  |  |  |
Gain (losses) on disposals of investments |  |  | $ 24 | $ (6)
Net earnings |  |  | 2,926 | 2,892
Createch |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Gain (losses) on disposals of investments |  |  | 39 |
Tax expense (income) relating to gain (loss) on sale of investment | $ 2 |  |  |
Forecast |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Proceeds from sale |  | $ 220 |  |
Other disposals of assets | Forecast |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Proceeds from sale | 54 |  |  |
Assets and liabilities classified as held for sale |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Gain (losses) on disposals of investments | $ 39 |  |  |
Revenue |  |  | 10 | 64
Net earnings |  |  | $ 0 | $ 5

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