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Income Taxes - Components of Income Tax Expense (Recovery) Recognized in Consolidated Statements of Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Current tax |  |
Current year | $ (327) | $ 608
Adjustments to prior year | 29 | (38)
Current tax | (298) | 570
Deferred tax |  |
Change related to temporary differences | 1,250 | (803)
Impact of U.S. Tax Reform | (320) | 472
Income tax expense | $ 632 | $ 239

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