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Property, Plant and Equipment - Summary of Property Plant and Equipment (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | $ 33,578 | $ 31,355 | $ 33,578
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 31,355 | 31,050 |
Additions | 4,306 | 4,153 |
Disposals | (67) | (55) |
Asset impairments | (1,244) | (2,690) |
Depreciation and amortization | (1,608) | (1,691) |
Transfers between classifications | 0 | 0 |
Decommissioning and restoration provision change in estimate | 870 | 489 |
Capitalized borrowing costs | 251 | 275 |
Changes in foreign exchange rates | (285) | (456) |
Closing net book value | 33,578 | 31,355 |
Net book value |  |  | 33,578
IFRS 16 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value |  | 31,330 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value |  | 31,330 |
Exploration and Evaluation |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 903 | 885 | 903
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 885 | 1,908 |
Additions | 22 | 119 |
Disposals | (1) | 0 |
Asset impairments | 0 | (1,129) |
Depreciation and amortization | 0 | 0 |
Transfers between classifications | 0 | 5 |
Decommissioning and restoration provision change in estimate | 0 | 0 |
Capitalized borrowing costs | 0 | 0 |
Changes in foreign exchange rates | (3) | (18) |
Closing net book value | 903 | 885 |
Net book value |  |  | 903
Exploration and Evaluation | IFRS 16 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value |  | 1,908 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value |  | 1,908 |
Mineral Properties |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 14,535 | 14,182 | 14,535
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 14,182 | 14,705 |
Additions | 0 | 0 |
Disposals | 0 | (2) |
Asset impairments | (261) | (485) |
Depreciation and amortization | (288) | (325) |
Transfers between classifications | 65 | (112) |
Decommissioning and restoration provision change in estimate | 814 | 444 |
Capitalized borrowing costs | 84 | 115 |
Changes in foreign exchange rates | (61) | (158) |
Closing net book value | 14,535 | 14,182 |
Net book value |  |  | 14,535
Mineral Properties | IFRS 16 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value |  | 14,705 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value |  | 14,705 |
Land, Buildings, Plant and Equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 7,577 | 8,352 | 7,577
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 8,352 | 9,357 |
Additions | 368 | 201 |
Disposals | (54) | (53) |
Asset impairments | (983) | (1,008) |
Depreciation and amortization | (774) | (774) |
Transfers between classifications | 652 | 418 |
Decommissioning and restoration provision change in estimate | 56 | 45 |
Capitalized borrowing costs | 0 | 0 |
Changes in foreign exchange rates | (40) | (114) |
Closing net book value | 7,577 | 8,352 |
Net book value |  |  | 7,577
Land, Buildings, Plant and Equipment | IFRS 16 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value |  | 9,637 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value |  | 9,637 |
Capitalized Production Stripping Costs |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 2,644 | 2,644 | 2,644
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 2,644 | 2,566 |
Additions | 563 | 757 |
Disposals | (5) | 0 |
Asset impairments | 0 | (68) |
Depreciation and amortization | (546) | (592) |
Transfers between classifications | 0 | 13 |
Decommissioning and restoration provision change in estimate | 0 | 0 |
Capitalized borrowing costs | 0 | 0 |
Changes in foreign exchange rates | (12) | (32) |
Closing net book value | 2,644 | 2,644 |
Net book value |  |  | 2,644
Capitalized Production Stripping Costs | IFRS 16 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value |  | 2,566 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value |  | 2,566 |
Construction In Progress |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 7,919 | 5,292 | 7,919
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 5,292 | 2,514 |
Additions | 3,353 | 3,076 |
Disposals | (7) | 0 |
Asset impairments | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Transfers between classifications | (717) | (324) |
Decommissioning and restoration provision change in estimate | 0 | 0 |
Capitalized borrowing costs | 167 | 160 |
Changes in foreign exchange rates | (169) | (134) |
Closing net book value | 7,919 | 5,292 |
Net book value |  |  | 7,919
Construction In Progress | IFRS 16 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value |  | 2,514 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value |  | 2,514 |
Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 49,356 | 49,356 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 49,356 | 47,753 |
Closing net book value |  | 49,356 |
Net book value |  |  | 52,900
Cost | Exploration and Evaluation |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 885 | 885 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 885 | 1,908 |
Closing net book value |  | 885 |
Net book value |  |  | 903
Cost | Mineral Properties |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 20,155 | 20,155 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 20,155 | 20,444 |
Closing net book value |  | 20,155 |
Net book value |  |  | 20,758
Cost | Land, Buildings, Plant and Equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 16,951 | 16,951 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 16,951 | 17,452 |
Closing net book value |  | 16,951 |
Net book value |  |  | 16,722
Cost | Capitalized Production Stripping Costs |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 6,073 | 6,073 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 6,073 | 5,435 |
Closing net book value |  | 6,073 |
Net book value |  |  | 6,598
Cost | Construction In Progress |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 5,292 | 5,292 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 5,292 | 2,514 |
Closing net book value |  | 5,292 |
Net book value |  |  | 7,919
Accumulated depreciation |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | (18,001) | (18,001) |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | (18,001) | (16,703) |
Closing net book value |  | (18,001) |
Net book value |  |  | (19,322)
Accumulated depreciation | Exploration and Evaluation |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 0 | 0 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | 0 | 0 |
Closing net book value |  | 0 |
Net book value |  |  | 0
Accumulated depreciation | Mineral Properties |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | (5,973) | (5,973) |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | (5,973) | (5,739) |
Closing net book value |  | (5,973) |
Net book value |  |  | (6,223)
Accumulated depreciation | Land, Buildings, Plant and Equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | (8,599) | (8,599) |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | (8,599) | (8,095) |
Closing net book value |  | (8,599) |
Net book value |  |  | (9,145)
Accumulated depreciation | Capitalized Production Stripping Costs |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | (3,429) | (3,429) |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | (3,429) | (2,869) |
Closing net book value |  | (3,429) |
Net book value |  |  | (3,954)
Accumulated depreciation | Construction In Progress |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value | 0 | 0 |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Opening net book value | $ 0 | 0 |
Closing net book value |  | $ 0 |
Net book value |  |  | $ 0

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_75_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&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 a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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