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Asset and Goodwill Impairment Testing - Summary of Pre-tax Impairment Reversal and (Asset Impairments) Recorded in Statement of Profit and Loss (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Impairment reversal and (asset impairments) | CAD 163 | CAD (294)
Steelmaking coal CGU [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Impairment reversal | 207 |
Fort Hills oil sands project [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments |  | (222)
Other [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | CAD (44) | CAD (72)

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- Definition The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_129_a&doctype=Standard -URIDate 2017-03-09 + Details
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