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Income Taxes - Summary of Deferred Tax Expense Charged (Credited) to Income Statement (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | CAD 444 | CAD 42
Deferred tax expense (income) relating to origination and reversal of temporary differences | 439 | 50
Net operating loss carryforwards [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | 133 | (154)
Capital allowances in excess of depreciation [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | 775 | 311
Decommissioning and restoration provisions [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | (393) | (212)
U.S. alternative minimum tax credits [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | (31) | (9)
Unrealized foreign exchange [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | 89 | 113
Withholding taxes [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | (10) | 4
Retirement benefit plans [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | 4 | 2
Other temporary differences [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | CAD (128) | CAD (5)

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- Definition The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 80 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income that will be reclassified to profit or loss. [Refer: Income tax relating to components of other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91&doctype=Standard -URIDate 2017-03-09 + Details
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