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Regulatory Assets and Liabilities (Regulated Assets) (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Regulatory Assets [Line Items]        
Regulatory Assets, Current $ 165 $ 138    
Regulatory Assets, Noncurrent 1,404 1,273    
Regulatory Assets, Total 1,569 1,411    
Deferred income tax regulatory assets [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 775 667    
Pension and post-retirement medical plan [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 453 380 [1]    
Pension and post-retirement medical plan [Member] | Prior period reclassification [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total   35    
Cost Recovery Clauses [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 75 17    
Environmental remediations [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 31 41    
GBPC Hurricane Matthew restoration [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 28 28    
Stranded cost recovery [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 28 25    
Unamortized Defeasance Costs [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 26 32    
Demand Side Management [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 24 28    
Demand Side Management [Member] | Nova Scotia Utility and Review Board [Member] | NSPI [Member]        
Regulatory Assets [Line Items]        
DSM deferral       $ 35
Demand Side Management [Member] | EfficiencyOne [Member] | NSPI [Member]        
Regulatory Assets [Line Items]        
DSM deferral     $ 31  
Deferrals related to derivative instruments [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 10 15    
Storm Reserve [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total 4 59    
Other Regulatory Assets (Liabilities) [Member]        
Regulatory Assets [Line Items]        
Regulatory Assets, Total $ 115 $ 119    
[1]
The December 31, 2017 pension and post-retirement medical plan regulatory asset includes a prior period reclassification of $35 million from AOCI, for changes in unrecognized pension and post-retirement benefit costs to be consistent with current year presentation. Refer to note 10 for further details.