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Property, plant and equipment (Details) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Total cost | CAD 23,673 | CAD 9,995
Less: Accumulated depreciation | (7,787) | (3,737)
Property, Plant and Equipment, Net | 17,290 | 6,469
Net Book Value | 15,886 | 6,258
Electric Generation Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Total cost | CAD 10,553 | 4,957
Electric Generation Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Electric Generation Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 131 years |
Electric Transmission [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Total cost | CAD 2,799 | 1,603
Electric Transmission [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 28 years |
Electric Transmission [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 75 years |
Electric Distribution [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Total cost | CAD 5,715 | 2,503
Electric Distribution [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 11 years |
Electric Distribution [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 80 years |
Gas, Transmission and Distribution Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Total cost | CAD 2,895 | 0
Gas, Transmission and Distribution Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 10 years |
Gas, Transmission and Distribution Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 85 years |
Other Energy Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Total cost | CAD 1,711 | 932
Other Energy Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Other Energy Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 50 years |
Construction in Progress [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Total cost | CAD 1,404 | CAD 211

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- Definition Amount of accumulated depreciation, depletion and amortization for 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 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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