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Decommissioning and Other Provisions - Change in Decommissioning and Other Provision Balances (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in other provisions [abstract] |  |
Balance | $ 689 | $ 729
Liabilities acquired (Note 4) | 156 |
Liabilities incurred | 18 | 5
Liabilities settled | (45) | (50)
Accretion | 50 | 48
Transfer to accounts payable | (31) |
Transfer to Assets Held for Sale | (1) |
Revisions in estimated cash flows | 41 | (89)
Revisions in discount rates | 35 | 52
Change in foreign exchange rates | 21 | (6)
Balance | 933 | 689
Decommissioning and restoration |  |
Reconciliation of changes in other provisions [abstract] |  |
Balance | 656 | 688
Liabilities acquired (Note 4) | 101 |
Liabilities incurred | 6 | 1
Liabilities settled | (41) | (37)
Accretion | 50 | 47
Transfer to accounts payable | 0 |
Transfer to Assets Held for Sale | (1) |
Revisions in estimated cash flows | 21 | (89)
Revisions in discount rates | 35 | 52
Change in foreign exchange rates | 21 | (6)
Balance | 848 | 656
Other provisions |  |
Reconciliation of changes in other provisions [abstract] |  |
Balance | 33 | 41
Liabilities acquired (Note 4) | 55 |
Liabilities incurred | 12 | 4
Liabilities settled | (4) | (13)
Accretion | 0 | 1
Transfer to accounts payable | (31) |
Transfer to Assets Held for Sale | 0 |
Revisions in estimated cash flows | 20 | 0
Revisions in discount rates | 0 | 0
Change in foreign exchange rates | 0 | 0
Balance | $ 85 | $ 33

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- Definition The increase in other provisions resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; 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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- Definition The decrease in other provisions resulting from the transfer of those provisions to liabilities included in disposal groups classified as held for sale. [Refer: Other provisions; Disposal groups classified as held for sale [member]] + 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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- 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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- Definition The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [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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