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Supplemental Disclosure of Cash Flow Information - Supplemental Schedule Of Cash Flow Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement Of Cash Flows, Additional Disclosures [Abstract]      
Accounts receivable $ (850) $ 284 $ (1,310)
Current income tax (liabilities) assets 1,918 (295) (164)
Inventory (487) 98 (194)
Prepaids and other 39 (56) 2
Other long-term assets 0 (117) 117
Accounts payable 80 (147) 39
Accrued liabilities 525 (254) 265
Other long-term liabilities (154) (62) (23)
Net change in non-cash working capital, operating activities 964 (166) (1,033)
Net change in non-cash working capital, investing activities 107 (383) (235)
Net changes in non-cash working capital 1,071 (549) (1,268)
Exploration and evaluation assets      
Expenditures on exploration and evaluation assets 12 36 73
Net proceeds on sale of exploration and evaluation assets (11) (31) 0
Net expenditures on exploration and evaluation assets 1 5 73
Deferred purchase consideration payable $ 48 $ 72 $ 95
Deferred purchase consideration payable, payable period 2 years