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Net Other Operating (Income) Loss - Narrative (Details) $ in Millions, $ in Millions		3 Months Ended	12 Months Ended
	Jul. 20, 2018 CAD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 CAD ($)	Dec. 31, 2021 USD ($)
Analysis of income and expenses [Line Items]
Alberta Off-Coal Agreement	$ (40)		$ (40)	$ (40)	$ (40)
Annual cash payments, net		$ 37
Liquidated damages recoverable			(12)	0	0
Insurance recoveries			(7)	0	0
Supplier and other contract settlements			(5)	(34)	0
Onerous contract provisions			$ 0	14	$ 29
Sundance Unit 5
Analysis of income and expenses [Line Items]
Net deferred tax assets		$ 10		$ 10		$ 8

X

- Definition

The amount of income recognised from the reimbursement of a claim as a result of the occurrence of an insured event covered by an insurance contract. [Refer: Types of insurance contracts [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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
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Analysis of income and expenses [Line Items]

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- Definition

Gain (loss) on energy supply agreement

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- Definition

Gains (Losses) on Contract Agreement

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Gains (Losses) on Contract Agreement, Net

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Liquidated Damages Recoverable

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- Definition

Supplier Settlement

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