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Property, Plant, and Equipment - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]      
Capitalized additions $ 16 $ 14 $ 8
Mine depreciation 0 190 $ 144
Other work performed by entity and capitalised 16 $ 14  
Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Mine depreciation 132    
Assets under construction      
Disclosure of detailed information about property, plant and equipment [line items]      
Construction in progress $ 77