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Asset Impairment Charges - Detailed Information About Property, Plant, and Equipment (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | $ 9 | $ 648 | $ 84
Impairment charges |  | 0 | 10 |
Hydro generation |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Impairment charges |  |  | 1 |
Kaybob Cogeneration Project | Corporate |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | (2) | 27 | 0
Impairment charges | $ 27 |  |  |
Hydro |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | 21 | 5 | 2
Wind and Solar |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | 43 | 12 | 0
Gas |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | 0 | 5 | 0
Energy Transition |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | 0 | 540 | 82
Changes in decommissioning and restoration provisions on retired assets |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | (53) | 32 | 0
Intangible asset impairment charges - Coal Rights |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | 0 | 17 | 0
Project development costs |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Asset impairment charges |  | $ 0 | 10 | $ 0
Project development costs | Hydro generation |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Impairment charges |  |  | $ 9 |

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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; 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 v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 98 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_98_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_99&doctype=Standard -URIDate 2022-03-24 + Details
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