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Financial Instruments - Carrying Amounts and Reconciliation of Derivative Financial Instruments (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) MMBTU | Dec. 31, 2024 USD ($) MMBTU | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivatives held for trading |  |  | $ 5 | $ 9 |
Current portion of other long-term assets |  |  | 13 | 12 |
Current portion of other long-term liabilities |  |  | (8) | (4) |
Other long-term assets |  |  | 0 | 1 |
Derivative financial asset (liability), net |  |  | 5 | 9 | $ 6
Derivative, volume per day | MMBTU |  | 50,000 |  |  |
Derivative, AECO fixed price |  | $ 1.82 |  |  |
Derivative Contract One |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivative, volume per day | MMBTU | 12,500 |  |  |  |
Derivative, AECO fixed price | $ 1.47 |  |  |  |
Derivative Contract Two |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivative, volume per day | MMBTU | 25,000 |  |  |  |
Derivative, AECO fixed price | $ 1.82 |  |  |  |
Natural Gas |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivatives held for trading |  |  | 7 | (3) |
Foreign currency forward contracts |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivatives held for trading |  |  | $ (2) | $ 12 |

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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 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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