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Expenses by Nature - Schedule of Expenses by Nature (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of expenses [abstract]    
Wages and salaries CAD 899 CAD 858
Employee benefits and other wage-related costs 236 250
Bonus payments 192 162
Post-employment benefits and pension costs 122 112
Employee benefits expense 1,449 1,382
Transportation 1,331 1,270
Depreciation and amortization 1,467 1,385
Raw material purchases 824 876
Fuel and energy 657 596
Operating supplies consumed 569 558
Maintenance and repair supplies 698 586
Contractors and consultants 570 427
Overhead costs 287 293
Royalties 453 312
Other operating costs 9 13
Expense nature 8,314 7,698
Capitalized production stripping costs (678) (477)
Change in inventory 12 (137)
Total cost of sales, general and administration, exploration and research and development expenses CAD 7,648 CAD 7,084