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Financial Instruments - Summary of Unrealized Risk Management Positions (Detail) - CAD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management net asset (liability) | $ 64 | $ 7
Power Swap Contracts |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management net asset (liability) | 3 |
Level 2 of fair value hierarchy |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk management asset | 73 | 20
Risk management liability | 9 | 13
Risk management net asset (liability) | 64 | 7
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 | 9 | 9
Risk management liability | 1 | 10
Risk management net asset (liability) | 8 | (1)
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 | 3 | 6
Risk management liability | 0 | 0
Risk management net asset (liability) | 3 | 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 | 61 | 5
Risk management liability | 4 | 0
Risk management net asset (liability) | 57 | 5
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 | 4 | 3
Risk management net asset (liability) | $ (4) | $ (3)

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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 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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