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Risk Management - Net Fair Value of Risk Management Positions (Detail) MMBbls in Millions, $ in Millions | Sep. 30, 2023 CAD ($) $ / bbl MMBbls | Dec. 31, 2022 CAD ($)
--- | --- | ---
Disclosure of Derivative Financial Instruments [Line Items] |  |
Fair Value Asset (Liability) | $ (27) | $ 46
Power Swap Contracts |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |
Fair Value Asset (Liability) | 2 |
Renewable Power Contracts |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |
Fair Value Asset (Liability) | 21 |
Foreign Exchange Contracts |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |
Fair Value Asset (Liability) | $ (1) |
WTI Fixed - Sell | Crude Oil and Condensate Contracts |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |
Notional Volumes | MMBbls | 6.2 |
Weighted Average Price | $ / bbl | 83.06 |
Fair Value Asset (Liability) | $ (52) |
WTI Fixed - Buy | Crude Oil and Condensate Contracts |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |
Notional Volumes | MMBbls | 2.6 |
Weighted Average Price | $ / bbl | 86.23 |
Fair Value Asset (Liability) | $ 13 |
Other financial positions |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |
Fair Value Asset (Liability) | $ (10) |

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