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Income Taxes - Summary of Provision for Income Taxes (Detail) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Current |  |
Current taxes on profits for the year | CAD 1,014 | CAD 551
Adjustments for current taxes of prior periods | (15) | (14)
Total current taxes | 999 | 537
Deferred |  |
Origination and reversal of temporary differences | 444 | 42
Adjustments to deferred taxes of prior periods | 23 | (2)
Tax losses not recognized (recognition of previously unrecognized losses) | (9) | (10)
Effect due to tax legislative changes | (19) | 20
Total deferred taxes | 439 | 50
Provision for income taxes | CAD 1,438 | CAD 587

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