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Property, Plant, and Equipment (Details) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]      
Interest costs capitalised CAD 9 CAD 16 CAD 9
Capitalisation rate of borrowing costs eligible for capitalisation 5.87%   5.93%
Mining property and equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Assets under finance leases CAD 65 CAD 76