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Income Taxes - Summary of Reconciliation of Income Taxes (Detail) - CAD ($) $ in Millions | 12 Months Ended
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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

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- Definition 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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition 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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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