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Revenue Contract Balances (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in Contract Liabilities [Roll Forward]
Contract liabilities at beginning of period	$ 80
Current contract liabilities	1	$ 8
Contract liabilities at end of period	14	80
IFRS 15
Changes in Contract Liabilities [Roll Forward]
Contract liabilities at beginning of period	88	62
IFRS 16 and 15 transition adjustments(1)	15	17
Amounts transferred to revenue included in opening balance	(10)	(10)
Consideration received	5	13
Increases due to interest accrued and expensed during the period	5	6
Contract termination associated with the purchase of Keephills 3 (Note 4(D))	(88)	0
Contract liabilities at end of period	$ 15	$ 88

X

- Definition

The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]]

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- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

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- Definition

The amount of current contract liabilities. [Refer: Contract liabilities]

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- Definition

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- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue]

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- Definition

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Increase (Decrease) Due To Interest Accrued And Expensed During Period, Contract Liabilities

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