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Financial Instruments - Narrative (Detail) - CAD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [Line Items] |  |
Borrowings | $ 11,228 | $ 12,385
Net realized loss on crude oil contracts | 467 |
Estimated fair value of contingent payment | 0 | 236
Acquisition From ConocoPhillips Company |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Estimated fair value of contingent payment | 177 |
Level 2 of fair value hierarchy |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Debt, fair value | $ 10,700 | $ 13,700

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