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Income taxes - Significant Components of Income Taxes Deducted from Net Earnings (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Current taxes |  |
Current taxes | $ (776) | $ (761)
Uncertain tax positions | 26 | 6
Change in estimate relating to prior periods | 32 | 22
Previously unrecognized tax benefits | 40 | 0
Deferred taxes |  |
Deferred taxes relating to the origination and reversal of temporary differences | (107) | (316)
Change in estimate relating to prior periods | (26) | (8)
Recognition and utilization of loss carryforwards | 15 | (106)
Effect of change in provincial corporate tax rate | 9 | 25
Uncertain tax positions | (5) | 9
Total income taxes from continuing operations | $ (792) | $ (1,129)

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