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Risk Management - Net Fair Value of Risk Management Positions (Detail) $ in Millions | Dec. 31, 2022 CAD ($) $ / barrel MMBbls | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
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Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 46 | $ (68) | $ (53)
Power Swap Contracts |  |  |
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 | $ 90 |  |
WTI Fixed – Sell | Crude Oil and Condensate Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Notional Volume | MMBbls | 3.2 |  |
Weighted Average Price | $ / barrel | 80.35 |  |
Fair value of derivative financial instruments net | $ 1 |  |
WTI Fixed – Buy | Crude Oil and Condensate Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Notional Volume | MMBbls | 2.3 |  |
Weighted Average Price | $ / barrel | 79.93 |  |
Fair value of derivative financial instruments net | $ 0 |  |
Other Financial Positions |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair value of derivative financial instruments net | $ (39) |  |

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