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v3.21.2

Update to Significant Accounting Policies, Critical Accounting Judgements and Key Sources of Estimation Uncertainty (Details) $ / shares in Units, $ in Billions | 9 Months Ended
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Sep. 30, 2021 CAD ($) $ / shares
WRB Refining LP |
Disclosure of changes in accounting estimates [line items] |
Proportion of ownership interest in joint operation | 50.00%
Sunrise Oil Sands Partnership |
Disclosure of changes in accounting estimates [line items] |
Proportion of ownership interest in joint operation | 50.00%
BP-Husky Refining LLC |
Disclosure of changes in accounting estimates [line items] |
Proportion of ownership interest in joint operation | 50.00%
Information technology assets |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 3 years
Land improvements and buildings | Bottom of range |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 15 years
Land improvements and buildings | Top of range |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 40 years
Office improvements and buildings | Bottom of range |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 3 years
Office improvements and buildings | Top of range |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 15 years
Refining equipment | Bottom of range |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 10 years
Refining equipment | Top of range |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 60 years
Other | Bottom of range |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 3 years
Other | Top of range |
Disclosure of changes in accounting estimates [line items] |
Useful life measured as period of time, property, plant and equipment | 60 years
The Plan |
Disclosure of changes in accounting estimates [line items] |
Target share price (in CAD per share) | $ / shares | $ 20
Target trading days | 20 days
The Incentive Plan |
Disclosure of changes in accounting estimates [line items] |
Target run-rate synergies | $ | $ 1.0
The Incentive Plan | Minimum |
Disclosure of changes in accounting estimates [line items] |
Cash award percentage of base salary | 15.00%
The Incentive Plan | Maximum |
Disclosure of changes in accounting estimates [line items] |
Cash award percentage of base salary | 30.00%

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