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Utility Capital Assets - Schedule of Utility Capital Assets (Details) - CAD CAD in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | CAD 40,193 | CAD 27,868
Accumulated Depreciation | (10,856) | (8,273)
Net Book Value | 29,337 | 19,595
Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | 9,616 | 9,245
Accumulated Depreciation | (2,752) | (2,634)
Net Book Value | 6,864 | 6,611
Gas Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | 3,956 | 3,829
Accumulated Depreciation | (1,096) | (1,021)
Net Book Value | 2,860 | 2,808
Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | 12,616 | 3,093
Accumulated Depreciation | (2,876) | (997)
Net Book Value | 9,740 | 2,096
Gas Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | 1,776 | 1,735
Accumulated Depreciation | (562) | (531)
Net Book Value | 1,214 | 1,204
Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | 6,884 | 6,465
Accumulated Depreciation | (2,474) | (2,241)
Net Book Value | 4,410 | 4,224
Other |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | 3,497 | 2,429
Accumulated Depreciation | (1,096) | (849)
Net Book Value | 2,401 | 1,580
Assets under construction |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | 1,559 | 886
Accumulated Depreciation | 0 | 0
Net Book Value | 1,559 | 886
Land |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Cost | 289 | 186
Accumulated Depreciation | 0 | 0
Net Book Value | CAD 289 | CAD 186

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