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Equity - Summary of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income - beginning of year | CAD 422 | CAD 426
Unrealized losses on translation of foreign subsidiaries | (155) | (21)
Unrealized gains (losses) (net of taxes of $1 and $(6)) | (10) | 16
Share of other comprehensive income (loss) of associates and joint ventures | (1) | 1
Remeasurements of retirement benefit plans (net of taxes of $(55) and $(7)) | 129 | 19
Total other comprehensive income (loss) | (37) | 15
Less remeasurements of retirement benefit plans recorded in retained earnings | (129) | (19)
Accumulated other comprehensive income - end of year | 264 | 422
Accumulated other comprehensive income attributable to shareholders of the company [member] |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Total other comprehensive income (loss) | (29) | 15
Available-for-sale financial assets [member] |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Unrealized gains (losses) (net of taxes of $1 and $(6)) | (4) | 45
Gains reclassified to profit (net of taxes of $1 and $4) | (6) | (29)
Other comprehensive income net of tax available for sale financial assets | (10) | 16
Currency translation differences [member] |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Unrealized losses on translation of foreign subsidiaries | (488) | (201)
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries (net of taxes of $(46) and $(27)) | 341 | 180
Other comprehensive income net of tax exchange differences on translation | CAD (147) | CAD (21)

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- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) recognised in other comprehensive income on hedges of net investments in foreign operations, net of tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 39 -IssueDate 2017-01-01 -Paragraph 102 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=39&date=2017-03-01&anchor=para_102_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_b_i&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24E_a&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 9 -IssueDate 2017-01-01 -Paragraph 6.5.13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=9&date=2017-03-01&anchor=para_6.5.13_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) recognised in other comprehensive income on remeasuring available-for-sale financial assets, net of tax. [Refer: Financial assets available-for-sale] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_20_a_ii&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_91_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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