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Other expense - Narrative (Details) - CAD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 03, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of subsidiaries [line items] |  |  |  |
Gain (loss) on investment, equity loss of share obligation |  |  | $ (581) | $ (42)
Gain (losses) on disposals of investments |  |  | $ 80 | 24
Gains on disposal of non-current assets or disposal groups classified as held for sale and discontinued operations |  | $ 53 |  |
Production Studios |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Proportion of ownership interests sold | 63.00% |  | 63.00% |
Proceeds from sale of operations | $ 211 |  | $ 211 |
Gain recognised on disposal of assets or disposal groups constituting discontinued operation | $ 79 |  | $ 79 |
Createch |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Gain (losses) on disposals of investments |  |  |  | 39
Subsidiaries |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Gain (losses) on disposals of investments |  |  |  | $ 13
Real Estate Optimization Strategy |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Proceeds from sale of operations |  | $ 54 |  |

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