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Commitments and Contingencies (Guarantees and Letters of Credit) (Details)
$ in Millions, $ in Millions
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Guarantor Obligations [Line Items]        
Letters of Credit Outstanding, Amount $ 3   $ 3  
Nova Scotia Power Inc. [Member]        
Guarantor Obligations [Line Items]        
Letters of Credit Outstanding, Amount   $ 52   $ 49
Payment Guarantee | SeaCoast Gas Transmission, LLC        
Guarantor Obligations [Line Items]        
Guaranty Liabilities   45    
Letters of Credit Outstanding, Amount   27    
Surety Bonds        
Guarantor Obligations [Line Items]        
Letters of Credit Outstanding, Amount   $ 82   $ 67