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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Provision for decommissioning, restoration and rehabilitation costs [abstract] |  |
Beginning balance | $ 3,559 | $ 3,906
Liabilities Incurred | 14 | 22
Liabilities acuired | 5 | 48
Liabilities Settled | (221) | (215)
Liabilities divested | (5) | (89)
Change in Estimated Future Cash Flows | 330 | 693
Change in Discount Rates | 265 | (980)
Unwinding of Discount on Decommissioning Liabilities (Note 7) | 220 | 176
Exchange Rate Movements and Other | (12) | (2)
Ending balance | $ 4,155 | $ 3,559

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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 2023-01-01 -Paragraph 84 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84_e&doctype=Standard -URIDate 2023-03-23 + Details
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