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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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- 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 + Details
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- Definition 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 + Details
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