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Share capital (Details) - CAD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of classes of share capital [line items] |  |  |  |  |
Payments to acquire or redeem entity's shares |  | $ 51 | $ 71 | $ 157 | $ 162
Series AO Convertible Preference Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares redeemed (in shares) | 4,600,000 |  |  |  |
Value of shares | $ 118 |  |  |  |
Payments to acquire or redeem entity's shares | 115 |  |  |  |
Reduction of issued capital | $ 3 |  |  |  |

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