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Non-Controlling Interests - Summary of Information About Subsidiaries with Non-controlling Interests and Non-controlling Interest Balances (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of subsidiaries [line items] |  |
Total fair value | $ 175 |
Inversiones Mineras S A [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in associate | 13.50% |
Retained earnings [member] |  |
Disclosure of subsidiaries [line items] |  |
Purchase of non-controlling interests | $ (159) | $ (63)
Non-controlling interests [member] |  |
Disclosure of subsidiaries [line items] |  |
Purchase of non-controlling interests | $ (16) |

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- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d_iii&doctype=Standard -URIDate 2018-03-16 + Details
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