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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) $ / bbl | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Outstanding letters of credit | $ 441 | $ 364 |
Decommissioning liabilities | 1,248 | 1,235 | $ 875
Estimated fair value of contingent payment | $ 63 | 143 | $ 132
ConocoPhillips Company and Certain of its Subsidiaries [Member] |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Quarterly payment tenure | 5 years |  |
Average crude oil price | $ / bbl | 52.00 |  |
Estimated fair value of contingent payment | $ 63 | $ 143 |
Storage Tank [Member] |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Payments on future commitments not yet commenced | $ 31 |  |

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