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Decommissioning and Other Provisions - Change in Decommissioning and Other Provision Balances (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in other provisions [abstract] |  |
Balance | $ 729 | $ 827
Liabilities incurred | 5 | 24
Liabilities settled | (50) | (47)
Accretion | 48 | 49
Disposals |  | (5)
Revisions in estimated cash flows | (89) | 100
Revisions in discount rates | 52 | (225)
Reversals |  | (9)
Change in foreign exchange rates | (6) | 15
Balance | 689 | 729
Decommissioning and restoration |  |
Reconciliation of changes in other provisions [abstract] |  |
Balance | 688 | 793
Liabilities incurred | 1 | 1
Liabilities settled | (37) | (35)
Accretion | 47 | 49
Disposals |  | (5)
Revisions in estimated cash flows | (89) | 95
Revisions in discount rates | 52 | (225)
Reversals |  | 0
Change in foreign exchange rates | (6) | 15
Balance | 656 | 688
Other provisions |  |
Reconciliation of changes in other provisions [abstract] |  |
Balance | 41 | 34
Liabilities incurred | 4 | 23
Liabilities settled | (13) | (12)
Accretion | 1 | 0
Disposals |  | 0
Revisions in estimated cash flows | 0 | 5
Revisions in discount rates | 0 | 0
Reversals |  | (9)
Change in foreign exchange rates | 0 | 0
Balance | $ 33 | $ 41

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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2023-03-23 + 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 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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- 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 2023-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount recognised for new other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_d&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount reversed for unused other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84_d&doctype=Standard -URIDate 2023-03-23 + Details
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