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Financial Instruments - Summary of Unrealized Risk Management Positions (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Net | $ 12 | $ 46 | $ (68)
Power Swap Contacts |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Net | 2 |  |
Renewable Power Contracts |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Net | 18 |  |
Level 2 |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Net | (6) | (44) |
Level 2 | Commodity price risk |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Asset | 31 | 93 |
Liability | 19 | 47 |
Net | 12 | 46 |
Level 2 | Commodity price risk | Crude Oil, Natural Gas, Condensate and Refined Products |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Asset | 11 | 2 |
Liability | 19 | 40 |
Net | (8) | (38) |
Level 2 | Commodity price risk | Power Swap Contacts |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Asset | 2 | 1 |
Liability | 0 | 7 |
Net | 2 | (6) |
Level 2 | Commodity price risk | Renewable Power Contracts |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Asset | 18 | 90 |
Liability | 0 | 0 |
Net | $ 18 | $ 90 |

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_25&doctype=Standard -URIDate 2023-03-23 + Details
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