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Acquisitions - Husky Energy Inc. Narrative (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill | $ 2,923 | $ 3,473 |  | $ 2,272
Non-current assets held for sale |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill |  | 88 |  |
Oil Sands |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill | 2,923 | 3,473 |  |
Sunrise |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill | $ 0 | $ 550 |  |
Husky Energy, Inc. |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill recognised as of acquisition date |  |  | $ 1,289 |
Husky Energy, Inc. | Lloydminister Thermal | Oil Sands |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill |  |  | 651 |
Husky Energy, Inc. | Sunrise | Oil Sands |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill |  |  | 550 |
Husky Energy, Inc. | Tucker | Oil Sands |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill |  |  | $ 88 |

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