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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