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Other (expense) income - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of subsidiaries [line items] |  |
(Loss) gain on investment, equity loss of share obligation | $ 42 | $ 49
Gain (losses) on disposals of investments | 24 | $ (6)
Createch |  |
Disclosure of subsidiaries [line items] |  |
Gain (losses) on disposals of investments | 39 |
SUBSIDIARY |  |
Disclosure of subsidiaries [line items] |  |
Gain (losses) on disposals of investments | $ (13) |

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