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Expenses by Nature - Schedule of Expenses by Nature (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Employment-related costs: |  |
Wages and salaries | $ 971 | $ 1,057
Employee benefits and other wage-related costs | 272 | 280
Bonus payments | 128 | 207
Post-employment benefits and pension costs | 124 | 105
Employee benefits expense | 1,495 | 1,649
Transportation | 1,378 | 1,476
Depreciation and amortization | 1,510 | 1,619
Raw material purchases | 715 | 974
Fuel and energy | 697 | 881
Operating supplies consumed | 620 | 743
Maintenance and repair supplies | 648 | 742
Contractors and consultants | 648 | 768
Overhead costs | 268 | 277
Royalties | 266 | 343
Other operating costs | 62 | 45
Expense by nature | 8,307 | 9,517
Adjusted for: |  |
Capitalized production stripping costs | (499) | (680)
Change in inventory | 81 | 52
Total cost of sales, general and administration, exploration and research and innovation expenses | $ 7,889 | $ 8,889

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- Definition The amount of expenses aggregated according to their nature (for example, depreciation, purchases of materials, transport costs, employee benefits and advertising costs), and not reallocated among functions within the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 + Details
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