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Expenses by Nature - Schedule of Expenses by Nature (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Employment-related costs: |  |
Wages and salaries | $ 1,057 | $ 1,005
Employee benefits and other wage-related costs | 280 | 247
Bonus payments | 207 | 191
Post-employment benefits and pension costs | 105 | 112
Employee benefits expense | 1,649 | 1,555
Transportation | 1,476 | 1,408
Depreciation and amortization | 1,619 | 1,483
Raw material purchases | 974 | 914
Fuel and energy | 881 | 830
Operating supplies consumed | 743 | 640
Maintenance and repair supplies | 742 | 775
Contractors and consultants | 768 | 738
Overhead costs | 277 | 365
Royalties | 343 | 370
Other operating costs | 45 | 15
Expense by nature | 9,517 | 9,093
Adjusted for: |  |
Capitalized production stripping costs | (680) | (707)
Change in inventory | 52 | (197)
Total cost of sales, general and administration, exploration and research and innovation expenses | $ 8,889 | $ 8,189

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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 2019-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_102&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_99&doctype=Standard -URIDate 2019-03-27 + Details
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