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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disclosure Of Supplementary Cash Flow Information [Line Items] |  |  |  |
Accounts Receivable and Accrued Revenues | $ (399) | $ 263 | $ (1,273) | $ 437
Income Tax Receivable | 0 | (4) | 13 | (4)
Inventories | (106) | (21) | (1,120) | 460
Accounts Payable and Accrued Liabilities | 452 | 107 | 1,092 | (663)
Income Tax Payable | 51 | (2) | 6 | (7)
Total Non-Cash Working Capital | (2) | 343 | (1,282) | 223
Cash From (Used in) Operating | (166) | 328 | (1,498) | 275
Cash From (Used in) Investing | $ 164 | $ 15 | $ 216 | $ (52)

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