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income taxes - Expense composition (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Current income tax expense |  |
For the current reporting period | $ 483 | $ 205
Adjustments recognized in the current period for income taxes of prior periods | (5) | (82)
Total | 478 | 123
Deferred income tax expense (recovery) |  |
Arising from the origination and reversal of temporary differences | 75 | 361
Revaluation of deferred income tax liability to reflect future statutory income tax rates |  | 28
Adjustments recognized in the current period for income taxes of prior periods | (1) | 78
Total | 74 | 467
Income taxes | $ 552 | $ 590

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