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Income Taxes - Summary of Deferred Tax Expense Charged (Credited) to Income Statement (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | $ 686 | $ 436
Deferred tax expense (income) | 674 | 431
Net operating loss carryforwards [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | 234 | 127
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 | (92) | 775
Decommissioning and restoration provisions [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | 264 | (393)
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 | 105 | (31)
Unrealized foreign exchange [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | (11) | 89
Withholding taxes [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | 25 | (10)
Inventories [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | 32 | (12)
Other temporary differences [member] |  |
Disclosure of Income Taxes [line items] |  |
Deferred tax expense (income) relating to origination and reversal of temporary differences | $ 117 | $ (114)

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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2018-03-16 + Details
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