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Net Other Operating Expense (Income) (Details) $ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 20, 2018 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2021 USD ($)
Analysis of income and expenses [Line Items] |  |  |  |  |
Alberta Off-Coal Agreement | $ (40) | $ (40) | $ (40) | $ (40) |
Alberta off-coal agreement, annual cash payments, net |  | 37 |  |  |
Other operating income (expense) |  | 8 | (11) | (49) |
Onerous contract provisions |  | 14 | 29 | $ 0 |
Onerous contracts provision |  |  | $ 29 |  |
Sundance Unit 5 |  |  |  |  |
Analysis of income and expenses [Line Items] |  |  |  |  |
Net deferred tax assets |  | $ 10 |  |  | $ 8

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- Definition The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of provision for onerous contracts. An onerous contract is a contract in which the unavoidable costs of meeting the obligation under the contract exceed the economic benefits expected to be received under it. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_66&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard -URIDate 2021-03-24 + Details
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