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Decommissioning and Other Provisions - Other Provisions (Details) - CAD CAD in Millions		12 Months Ended
	Nov. 18, 2016	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other provisions [line items]
Reversal of unused provision		CAD (4)	CAD (96)
Keephills 1
Disclosure of other provisions [line items]
Reversal of unused provision	CAD 94

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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.

+ References

No definition available.

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- Definition

The amount reversed for unused other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2017-01-01
-Paragraph 84
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_d&doctype=Standard
-URIDate 2017-03-09

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