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Risk Management - Net Fair Value of Risk Management Positions (Detail) $ in Millions | 12 Months Ended |  |
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Dec. 31, 2024 CAD ($) $ / barrel | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 7 | $ 12 | $ 46
Fair value derivative financial instruments |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Average contract financial term | 14 months |  |
Power Contacts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 6 |  |
Renewable Power Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 5 |  |
WTI Fixed – Sell | Crude Oil and Condensate Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Notional volume | $ / barrel | 1,600,000 |  |
Weighted average price | $ / barrel | 70.18 |  |
Fair value of derivative financial instruments net | $ (3) |  |
WTI Fixed – Buy | Crude Oil and Condensate Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Notional volume | $ / barrel | 300,000 |  |
Weighted average price | $ / barrel | 72.80 |  |
Fair value of derivative financial instruments net | $ (1) |  |
Other Financial Positions |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 3 |  |

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