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Expenses by Nature - Schedule of Expenses by Nature (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of expenses [abstract]    
Wages and salaries $ 1,005 $ 899
Employee benefits and other wage-related costs 247 236
Bonus payments 191 192
Post-employment benefits and pension costs 112 122
Employee benefits expense 1,555 1,449
Transportation 1,408 1,245
Depreciation and amortization 1,483 1,492
Raw material purchases 914 824
Fuel and energy 830 657
Operating supplies consumed 640 569
Maintenance and repair supplies 775 698
Contractors and consultants 738 570
Overhead costs 365 287
Royalties 370 453
Other operating costs 15 9
Expense nature 9,093 8,253
Capitalized production stripping costs (707) (678)
Change in inventory (197) (3)
Total cost of sales, general and administration, exploration and research and development expenses $ 8,189 $ 7,572