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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

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