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Financial Instruments - Summary of Unrealized Risk Management Positions (Detail) - CAD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management net asset (liability) | $ (27) | $ 46
Power Swap Contracts |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management net asset (liability) | 2 |
Level 2 of fair value hierarchy |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management asset | 25 | 93
Risk management liability | 52 | 47
Risk management net asset (liability) | (27) | 46
Level 2 of fair value hierarchy | Commodity price risk | Crude Oil, Natural Gas, Condensate and Refined Products |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management asset | 0 | 2
Risk management liability | 49 | 40
Risk management net asset (liability) | (49) | (38)
Level 2 of fair value hierarchy | Commodity price risk | Power Swap Contracts |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management asset | 4 | 1
Risk management liability | 2 | 7
Risk management net asset (liability) | 2 | (6)
Level 2 of fair value hierarchy | Commodity price risk | Renewable Power Contracts |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management asset | 21 | 90
Risk management liability | 0 | 0
Risk management net asset (liability) | 21 | 90
Level 2 of fair value hierarchy | Currency risk | Foreign Exchange Rate Contracts |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management asset | 0 | 0
Risk management liability | 1 | 0
Risk management net asset (liability) | $ (1) | $ 0

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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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