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Joint Arrangements and Associate - Associate (Details) - CAD ($) shares in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 14, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Net Earnings (Loss) |  | $ 551 | $ (194) | $ 995 | $ (2,226) | $ (2,379) | $ 2,194 | $ (2,916)
Investment in Equity-Accounted Affiliate |  | $ 96 |  | $ 96 |  | $ 0 |  |
Headwater Exploration Inc. |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Share of Equity Investment |  | 25.00% |  | 25.00% |  |  |  |
Net Earnings (Loss) |  | $ 5 |  | $ (2) |  |  |  |
Proportionate Share of Equity Investment |  | 1 |  | (1) |  |  |  |
Investment in Equity-Accounted Affiliate |  | $ 96 |  | $ 96 |  |  |  |
Proceeds from sales of investment in equity-accounted affiliate | $ 228 |  |  |  |  |  |  |
Number of warrants held for investment |  | 15 |  | 15 |  |  |  |

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