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Non-Controlling Interests - Summary of Information About Subsidiaries with Non-controlling Interests and Non-controlling Interest Balances (Detail) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of subsidiaries [line items] |  |
Non controlling interests | CAD 142 | CAD 159
Carmen de Andacollo [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of Interest and Voti Principal Place of Business by Non-Controll | Region IV, Chile |
Ownership ng Rights Held ingInterest | 10.00% |
Non controlling interests | CAD 34 | 45
Quebrada Blanca [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of Interest and Voti Principal Place of Business by Non-Controll | Region I, Chile |
Ownership ng Rights Held ingInterest | 23.50% |
Non controlling interests | CAD 30 | 64
Elkview Mine Limited Partnership [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of Interest and Voti Principal Place of Business by Non-Controll | British Columbia, Canada |
Ownership ng Rights Held ingInterest | 5.00% |
Non controlling interests | CAD 53 | CAD 50
Compania Minera Zafranal S.A.C. [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of Interest and Voti Principal Place of Business by Non-Controll | Arequipa Region, Peru |
Ownership ng Rights Held ingInterest | 20.00% |
Non controlling interests | CAD 25 |

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- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_f&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 q -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_q&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2017-01-01 -Paragraph 22 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=10&date=2017-03-01&anchor=para_22&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The principal place of business of a subsidiary. [Refer: Principal place of business; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_ii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_ii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_b&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 19B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_b&doctype=Standard -URIDate 2017-03-09 + Details
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