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Income Taxes - Summary of Major Temporary Differences (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | $ 13,592 | $ 13,091 |  |
Deferred income tax assets | (3,372) | (2,947) |  |
Net deferred income tax liability | 10,220 | 10,144 | $ 10,539 | $ 11,451
Property, plant and equipment and exploration and evaluation assets |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 12,254 | 11,922 |  |
Lease assets |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 349 | 380 |  |
Investments |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 35 | 14 |  |
Investment in North West Redwater Partnership |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 850 | 767 |  |
Unrealized risk management activities |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 12 | 0 |  |
Unrealized foreign exchange on long-term debt |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 14 | 0 |  |
Deferred income tax assets | 0 | (20) |  |
Other |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 78 | 8 |  |
Asset retirement obligations |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (1,719) | (1,495) |  |
Lease liabilities |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (363) | (388) |  |
Share-based compensation |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (22) | (12) |  |
Loss carryforwards |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | $ (1,268) | $ (1,032) |  |

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