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Decommissioning and Other Provisions - Change in Decommissioning and Other Provision Balances (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of changes in other provisions [abstract] |  |
Balance | $ 827 | $ 673
Liabilities incurred | 24 | 30
Liabilities settled | (47) | (80)
Accretion | (49) | 32
Acquisition of liabilities |  | 2
Disposals | (5) |
Revisions in estimated cash flows | 100 | 179
Revisions in discount rates | (225) | (6)
Reversals | (9) | (3)
Change in foreign exchange rates | 15 |
Balance | 729 | 827
Decommissioning and restoration |  |
Reconciliation of changes in other provisions [abstract] |  |
Balance | 793 | 608
Liabilities incurred | 1 | 8
Liabilities settled | (35) | (18)
Accretion | (49) | 32
Acquisition of liabilities |  | 2
Disposals | (5) |
Revisions in estimated cash flows | 95 | 167
Revisions in discount rates | (225) | (6)
Reversals | 0 | 0
Change in foreign exchange rates | 15 |
Balance | 688 | 793
Other provisions |  |
Reconciliation of changes in other provisions [abstract] |  |
Balance | 34 | 65
Liabilities incurred | 23 | 22
Liabilities settled | (12) | (62)
Accretion | 0 | 0
Acquisition of liabilities |  | 0
Disposals | 0 |
Revisions in estimated cash flows | 5 | 12
Revisions in discount rates | 0 | 0
Reversals | (9) | (3)
Change in foreign exchange rates | 0 |
Balance | $ 41 | $ 34

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- Definition The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2022-03-24 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84&doctype=Standard -URIDate 2022-03-24 + Details
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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 2022-03-24 -Paragraph 73 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 84 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_e&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 84 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_b&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 84 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_d&doctype=Standard -URIDate 2022-03-24 + Details
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