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Utility Capital Assets - Narrative (Details) CAD in Millions	12 Months Ended
	Dec. 31, 2016 CAD kPa kV	Dec. 31, 2015 CAD
Regulated Operations [Abstract]
Electric distribution capacity (kV) | kV	69
Gas distribution capacity (kPa) | kPa	2,070
Gas distribution capacity, hoop stress (percent)	20.00%
Electric transmission capacity (kV) | kV	69
Gas transmission capacity, and higher (kPa) | kPa	2,070
Gas transmission capacity, hoop stress (percent)	20.00%
Capital assets under capital lease | CAD	CAD 539	CAD 496
Capital assets under capital lease accumulated depreciation | CAD	CAD 231	CAD 221

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Public Utilities, Electric Distribution Capacity

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Public Utilities, Electric Transmission Capacity

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- Definition

Public Utilities, Gas Distribution Capacity

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- Definition

Public Utilities, Gas Distribution Capacity, Hoop Stress, Percent

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 2)
-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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