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Risk Management - Net Fair Value of Risk Management Positions (Detail) $ in Millions | Dec. 31, 2023 CAD ($) $ / barrel | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
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Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 12 | $ 46 | $ (68)
Power Swap Contacts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | 2 |  |
Renewable Power Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 18 |  |
WTI Fixed – Sell | Crude Oil and Condensate Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Notional volume | $ / barrel | 3,500,000 |  |
Weighted average price | $ / barrel | 75.22 |  |
Fair value of derivative financial instruments net | $ 16 |  |
WTI Fixed – Buy | Crude Oil and Condensate Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Notional volume | $ / barrel | 1,500,000 |  |
Weighted average price | $ / barrel | 73.69 |  |
Fair value of derivative financial instruments net | $ (4) |  |
Other Financial Positions |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ (20) |  |

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