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Risk Management - Net Fair Value of Risk Management Positions (Detail) MMBbls in Millions, $ in Millions | Dec. 31, 2021 CAD ($) MMBbls $ / bbl | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
--- | --- | --- | ---
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair Value Asset (Liability) | $ (68) | $ (53) | $ 3
WTI Fixed - Sell | Crude Oil and Condensate Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Notional Volumes | MMBbls | 61.8 |  |
Weighted Average Price | $ / bbl | 72.19 |  |
Fair Value Asset (Liability) | $ (188) |  |
WTI Fixed - Buy | Crude Oil and Condensate Contracts |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Notional Volumes | MMBbls | (25.3) |  |
Weighted Average Price | $ / bbl | 71.55 |  |
Fair Value Asset (Liability) | $ 94 |  |
Other financial positions |  |  |
Disclosure of Derivative Financial Instruments [Line Items] |  |  |
Fair Value Asset (Liability) | $ 24 |  |

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