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Segments Disclosures - Depreciation and Amortization on the Consolidated Statements of Cash Flows (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [abstract]      
Depreciation and amortization $ 529 $ 654 $ 590
Mine depreciation 190 144 119
Depreciation and amortization on the Consolidated Statements of Cash Flows $ 719 $ 798 $ 709