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Asset Impairments and Transactions -Terra Nova (Details) - Exploration and Production - Terra Nova $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 CAD ($) $ / bbl bbl / d | Jun. 30, 2021 | Jun. 30, 2021
Asset Impairments and Transactions |  |  |
Ownership interest (as percent) | 48.00% | 38.00% | 38.00%
Consideration received, net of tax | $ 26 |  |
Tax effect of consideration received | $ 8 |  |
Additional interest acquired (as a percent) | 10.00% |  |
Reversal of impairment loss, net of tax | $ 168 |  |
Tax effect of the reversal of impairment loss | $ 53 |  |
Impairment testing assumption, risk-adjusted discount rate, after tax | 9.00% |  |
Recoverable amount of CGU | $ 177 |  |
Forecast for the life of the project |  |  |
Asset Impairments and Transactions |  |  |
Impairment testing assumption, share of barrels per day of crude oil produced | bbl / d | 6,000 |  |
Brent crude oil | Forecast for 2023 |  |  |
Asset Impairments and Transactions |  |  |
Impairment testing assumption, price per barrel | $ / bbl | 65.00 |  |
Brent crude oil | Forecast for 2024 |  |  |
Asset Impairments and Transactions |  |  |
Impairment testing assumption, price per barrel | $ / bbl | 68.00 |  |
Brent crude oil | Forecast for 2025 to 2033 |  |  |
Asset Impairments and Transactions |  |  |
Impairment testing assumption, price per barrel escalation percentage | 2.00% |  |

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