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Income taxes - Significant components of tax expense (income) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Current taxes |  |
Current taxes | $ (758) | $ (850)
Uncertain tax positions | (9) | (14)
Change in estimate relating to prior periods | 40 | 14
Other | 0 | (1)
Deferred taxes |  |
Deferred taxes relating to the origination and reversal of temporary differences | (41) | (299)
Change in estimate relating to prior periods | 11 | 32
Recognition and utilization of loss carryforwards | (304) | (1)
Effect of change in provincial corporate tax rate | (3) | 4
Resolution of uncertain tax positions | 25 | 5
Total income taxes | $ (1,039) | $ (1,110)

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