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Capital Management - Bank EBITDA (Details) - CAD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Corporate Information And Statement Of IFRS Compliance [Abstract]      
Net income (loss) - basic   $ 1,613,600 $ (2,438,964)
Financing and interest   111,159 125,441
Unrealized foreign exchange (gain) loss   (1,905) 9,232
Unrealized financial derivatives loss   103,631 18,500
Current income tax expense   1,272 574
Deferred income tax expense (recovery)   79,968 (160,967)
Depletion and depreciation   464,580 486,380
Depletion and depreciation     486,380
Gain on dispositions   (9,666) (901)
Impairment (impairment reversal) $ 2,588,488 (1,542,414) 2,360,220
Share-based compensation   6,389 7,216
Exploration and evaluation   15,212 14,011
Interest on lease obligations   (223) (448)
Early redemption expense   (1,851) (3,312)
Non-cash other income   $ (2,857) $ (2,128)