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Income Taxes - Summary of Temporary Differences Giving Rise to Deferred Income Tax Assets and Liabilities (Detail) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax assets | CAD 154 | CAD 112
Deferred income tax liabilities | 5,398 | 4,896
Net operating loss carryforwards [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax assets | 58 | 32
Deferred income tax liabilities | (1,059) | (1,218)
Property, plant and equipment [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax assets | (189) | 35
Deferred income tax liabilities | 7,390 | 6,881
Decommissioning and restoration provisions [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax assets | 78 |
Deferred income tax liabilities | (754) | (439)
U.S. alternative minimum tax credits [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax assets | 143 |
Deferred income tax liabilities |  | (112)
Unrealized foreign exchange [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax liabilities | (135) | (224)
Withholding taxes [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax liabilities | 79 | 89
Retirement benefit plans [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax assets | 23 |
Deferred income tax liabilities | (22) | (92)
Other temporary differences [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax assets | 41 | 45
Deferred income tax liabilities | CAD (101) | CAD 11

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_o&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_56&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_o&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_56&doctype=Standard -URIDate 2017-03-09 + Details
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