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Significant and Subsequent Events - Asset Acquisitions (Details) - Keephills 3 - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Oct. 01, 2019
Investment [Line Items]
Working capital		$ 11
Asset Acquisition, Asset, Property, Plant And Equipment		308
Property, plant and equipment	$ 308
Other assets		3
Other liabilities		(2)
Decommissioning and other provisions		(19)
Total acquisition cost		$ 301

X

- Definition

The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2019-01-01
-Paragraph 73
-Subparagraph e
-Clause i
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-URIDate 2019-03-27

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

Asset Acquisition, Asset, Property, Plant And Equipment

+ References

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- Definition

Asset Acquisition, Assets Acquired and Liabilities Assumed, Net

+ References

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- Definition

Asset Acquisition, Assets, Other

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- Definition

Asset Acquisition, Liabilities, Other

+ References

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- Definition

Asset Acquisition, Provision For Decommissioning, Restoration And Rehabilitation Costs

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- Definition

Asset Acquisition, Working Capital

+ References

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