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Income taxes - Significant Components of Income Taxes Deducted from Net Earnings (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Current taxes |  |
Current taxes | $ (872) | $ (776)
Uncertain tax positions | 12 | 26
Change in estimate relating to prior periods | 42 | 32
Previously unrecognized tax benefits | 0 | 40
Deferred taxes |  |
Deferred taxes relating to the origination and reversal of temporary differences | (184) | (107)
Change in estimate relating to prior periods | (40) | (26)
Recognition and utilization of loss carryforwards | (21) | 15
Previously unrecognized tax benefits | 15 | 0
Effect of change in provincial corporate tax rate | 0 | 9
Uncertain tax positions | 4 | (5)
Total income taxes from continuing operations | $ (1,044) | $ (792)

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