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Asset Transactions and Impairments - Forest Hills (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 02, 2023 CAD ($) | Feb. 01, 2023 CAD ($) | Dec. 31, 2022 | Sep. 30, 2022 CAD ($) $ / bbl $ / bbl $ / $ | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022
Fort Hills |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Term of long-range plan |  |  |  | 3 years |  |  |
Impairment charge, before tax |  |  |  | $ 2,600 |  |  |
Impairment charge, net of tax |  |  |  | $ 800 |  |  |
Impairment testing assumption, average cash operating costs per bbl | $ / bbl |  |  |  | 25.00 |  |  |
Impairment testing assumption, foreign exchange rate | $ / $ |  |  |  | 0.76 |  |  |
Impairment testing assumption, risk-adjusted discount rate, after tax |  |  |  | 8.25% |  |  |
Recoverable amount of CGU net of tax |  |  |  | $ 2,800 |  |  |
Fort Hills | Minimum |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Impairment testing assumption, share of barrels per day of crude oil produced |  |  |  | 87,000 |  |  |
Fort Hills | Maximum |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Impairment testing assumption, share of barrels per day of crude oil produced |  |  |  | 106,000 |  |  |
Forecast for 2023 | Fort Hills | WCS |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Impairment testing assumption, price per barrel | $ / bbl |  |  |  | 69.00 |  |  |
Forecast for 2024 | Fort Hills | WCS |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Impairment testing assumption, price per barrel | $ / bbl |  |  |  | 62.00 |  |  |
Forecast for 2025 to 2031 | Fort Hills | WCS | Average |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Impairment testing assumption, price per barrel | $ / bbl |  |  |  | 50.00 |  |  |
Forecast for 2032 to 2060 | Fort Hills | WCS |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Impairment testing assumption, price per barrel escalation percentage |  |  |  | 2.00% |  |  |
Sensitivity analysis, decrease in price | Fort Hills |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Impairment charge, net of tax |  |  |  | $ 1,000 |  |  |
Reasonably possible decrease in unobservable input (as a percent) |  |  |  | 5.00% |  |  |
Sensitivity analysis increase In discount rate | Fort Hills |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Impairment charge, net of tax |  |  |  | $ 200 |  |  |
Reasonably possible increase in unobservable input (as a percent) |  |  |  | 1.00% |  |  |
Fort Hills Project |  |  |  |  |  |  |
Asset Transactions and Impairments |  |  |  |  |  |  |
Ownership interest (as percent) | 68.76% |  |  |  |  | 100.00% | 54.11%
Acquisition of Teck's interest in Fort Hills |  |  |  |  |  |  |
Asset Transactions and Impairments |  |  |  |  |  |  |
Percentage of interest acquired | 14.65% |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Accounts receivable | $ 35 |  |  |  |  |  |
Inventory | 37 |  |  |  |  |  |
Property, plant and equipment | 1,149 |  |  |  |  |  |
Other assets | 6 |  |  |  |  |  |
Total assets acquired | 1,227 |  |  |  |  |  |
Accounts payable and other liabilities | (102) |  |  |  |  |  |
Lease liabilities | (284) |  |  |  |  |  |
Decommissioning provision | (83) |  |  |  |  |  |
Deferred income taxes | (46) |  |  |  |  |  |
Total liabilities assumed | (515) |  |  |  |  |  |
Net assets acquired | 712 |  |  |  |  |  |
Cash and cash equivalents | $ 3 |  |  |  |  |  |
Gross revenues contributed by acquired entity |  |  |  |  | $ 501 |  |
Net earnings (loss) contributed by acquired entity |  |  |  |  | $ 22 |  |
Gross revenues contributed if acquisition had occurred on January 1 |  |  |  |  |  | $ 52,200 |
Consolidated net earnings contributed if acquisition had occurred on January 1 |  |  |  |  |  | $ 8,300 |
Percentage of ownership interests to be purchased under agreement |  |  | 21.30% |  |  |  |
Acquisition of Teck's interest in Fort Hills | Pro Forma |  |  |  |  |  |  |
Purchase cost allocation |  |  |  |  |  |  |
Gross revenues contributed by acquired entity |  | $ 20 |  |  |  |  |
Net earnings (loss) contributed by acquired entity |  | $ (21) |  |  |  |  |

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