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Financial Instruments - Summary of Unrealized Risk Management Positions (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Net Asset (Liability) | $ 46 | $ (68) | $ (53)
Power Swap Contracts |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Net Asset (Liability) | (6) |  |
Renewable Power Contracts |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Net Asset (Liability) | 90 |  |
Level 2 of fair value hierarchy |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Net Asset (Liability) | (44) | (68) |
Level 2 of fair value hierarchy | Commodity price risk |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Asset | 93 | 48 |
Risk Management Liability | 47 | 116 |
Risk Management Net Asset (Liability) | 46 | (68) |
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 | 2 | 46 |
Risk Management Liability | 40 | 116 |
Risk Management Net Asset (Liability) | (38) | (70) |
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 | 1 | 0 |
Risk Management Liability | 7 | 0 |
Risk Management Net Asset (Liability) | (6) | 0 |
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 | 90 | 0 |
Risk Management Liability | 0 | 0 |
Risk Management Net Asset (Liability) | 90 | 0 |
Level 2 of fair value hierarchy | Currency risk | Exchange Rate Contracts |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Asset | 0 | 2 |
Risk Management Liability | 0 | 0 |
Risk Management Net Asset (Liability) | $ 0 | $ 2 |

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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 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 + Details
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