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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Provision for decommissioning, restoration and rehabilitation costs [abstract] |  |
Beginning balance | $ 4,155 | $ 3,559
Liabilities Incurred | 24 | 14
Liabilities acquired | 0 | 5
Liabilities Settled | (234) | (221)
Liabilities disposed | (72) | (5)
Change in Estimated Future Cash Flows | 276 | 330
Change in Discount Rates | 132 | 265
Unwinding of Discount on Decommissioning Liabilities (Note 7) | 225 | 220
Exchange Rate Movements and Other | 28 | (12)
Ending balance | $ 4,534 | $ 4,155

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- Definition The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84&doctype=Standard -URIDate 2024-03-27 + Details
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