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Financial Instruments - Carrying Amounts and Reconciliation of Derivative Financial Instruments (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) MMBTU | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Derivatives held for trading, asset (liability) |  | $ 9 | $ 6 |
Current portion of other long-term assets |  | 12 | 3 |
Current portion of other long-term liabilities |  | (4) | (3) |
Other long-term assets |  | 1 | 6 |
Derivative financial asset (liability), net |  | 9 | 6 | $ 55
Derivative, volume per day | MMBTU | 50,000 |  |  |
Derivative, AECO fixed price | $ 1.82 |  |  |
Natural Gas |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Derivatives held for trading, asset (liability) |  | (3) | 3 |
Foreign currency forward contracts |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Derivatives held for trading, asset (liability) |  | $ 12 | $ 3 |

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- Definition Derivative Financial Assets (Liabilities) Held For Trading + References No definition available. + Details
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- Definition Derivative Financial Assets (Liabilities), Net + References No definition available. + Details
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- Definition The amount of current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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