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Non-Controlling Interests - Summary of Information About Subsidiaries with Non-controlling Interests and Non-controlling Interest Balances (Detail) - CAD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 29, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Non-controlling interests |  | $ 669 | $ 770
Carmen de Andacollo |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of Ownership Interest Held by Non-Controlling Interest |  | 10.00% |
Percentage of Voting Rights Held by Non-Controlling Interest |  | 10.00% |
Non-controlling interests |  | $ 26 | 29
Elkview Mine Limited Partnership |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of Ownership Interest Held by Non-Controlling Interest |  | 5.00% |
Percentage of Voting Rights Held by Non-Controlling Interest |  | 5.00% |
Non-controlling interests |  | $ 74 | 67
Compañía Minera Zafranal S.A.C. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of Ownership Interest Held by Non-Controlling Interest |  | 20.00% |
Percentage of Voting Rights Held by Non-Controlling Interest |  | 20.00% |
Non-controlling interests |  | $ 43 | 40
Quebrada Blanca |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of Ownership Interest Held by Non-Controlling Interest |  | 40.00% |
Percentage of Voting Rights Held by Non-Controlling Interest |  | 40.00% |
Non-controlling interests | $ 793 | $ 526 | $ 634
Quebrada Blanca | SSM/SC |  |  |
Disclosure of subsidiaries [line items] |  |  |
Portion of additional interest acquired | 30.00% |  |

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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 2020-01-01 -Paragraph 12 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_12_f&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph q -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_q&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2020-01-01 -Paragraph 22 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=10&code=ifrs-tx-2020-en-r&anchor=para_22&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 12 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_12_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The proportion of the voting rights in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 12 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_12_d&doctype=Standard -URIDate 2020-01-01 + Details
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