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Net Other Operating Income - Disclosure of components of net other operating (income) losses (Details) - CAD ($) $ in Millions		12 Months Ended
	Jul. 20, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Analysis of income and expenses [Line Items]
Coal supply agreement		$ 29	$ 0	$ 0
Alberta Off-Coal Agreement	$ (40)	(40)	(40)	(40)
Insurance recoveries		0	(10)	(7)
Other operating expenses		0	1	0
Net other operating income		$ (11)	$ (49)	$ (47)

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]]

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- Definition

The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

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The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

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[Line Items] for Analysis of income and expenses [Table]

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Gain (loss) on energy supply agreement

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- Definition

Gains (Losses) on Contract Agreement

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