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Income Taxes - Summary of Reconciliation of Income Taxes (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Tax expense at the Canadian statutory income tax rate of 27% (2017 - 26.10%)	$ 1,217	$ 1,021
Resource taxes	360	368
Resource and depletion allowances	(80)	(127)
Non-temporary differences including one-half of capital gains and losses	(157)	14
Tax pools not recognized (recognition of previously unrecognized tax pools)	4	(9)
Effect due to tax legislative changes		(13)
Withholding taxes	47	57
Difference in tax rates in foreign jurisdictions	2	129
Revisions to prior year estimates	(21)	12
Other	(7)	(27)
Provision for income taxes	$ 1,365	$ 1,425

X

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]

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