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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Supplementary Cash Flow Information [Line Items] |  |  |
Accounts Receivable and Accrued Revenues | $ (953) | $ 77 | $ (475)
Income Tax Receivable | (1) | (12) | 150
Inventories | (1,646) | 450 | (408)
Accounts Payable and Accrued Liabilities | 1,645 | (338) | 283
Income Tax Payable | 87 | (17) | 0
Total Non-Cash Working Capital | (868) | 160 | (450)
Cash From (Used in) Operating | (1,227) | 198 | (333)
Cash From (Used in) Investing | $ 359 | $ (38) | $ (117)

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