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Cash Flow Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of cash flow statement [Abstract]      
Accounts receivable $ (28) $ (79) $ 261
Prepaid expenses 9 2 0
Income taxes receivable 0 (4) (6)
Inventory 42 6 (13)
Accounts payable, accrued liabilities and provisions 153 160 (130)
Income taxes payable (2) 4 9
Change in non-cash operating working capital balances $ 174 $ 89 $ 121