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Shareholders Capital - Additional Information (Detail) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 12, 2020 shares | Dec. 31, 2021 CAD ($) shares | Dec. 31, 2020 CAD ($) shares
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Number of share purchase and cancel |  | 155,168 |
Percentage of share purchase and cancel |  | 10.00% |
Purchase and cancel of shares | $ | $ |  | $ 4 |
Share consolidation ratio | 20 |  |
Number of common share used for consolidation adjustment | 37 |  |
Events After Reporting Period [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Number of share purchase and cancel |  |  | 420,588
Purchase and cancel of shares | $ | $ |  |  | $ 11
Top of Range [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Number of share purchase and cancel |  | 1,317,158 |

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