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Revenue (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas $ 1,044 $ 1,002
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 628 $ 503
Regulated Operation [Member] | Electricity [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 2,376  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 2,376  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 2,376  
Regulated Operation [Member] | Electricity [Member] | Commercial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,510  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,510  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,510  
Regulated Operation [Member] | Electricity [Member] | Industrial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 488  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 488  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 488  
Regulated Operation [Member] | Electricity [Member] | Other [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Regulated Operation [Member] | Electricity [Member] | Other [Member] | Other Electric and Regulatory Deferrals [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 371  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 371  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 371  
Regulated Operation [Member] | Oil And Gas Service [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 492  
Regulated Operation [Member] | Oil And Gas Service [Member] | Commercial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 291  
Regulated Operation [Member] | Oil And Gas Service [Member] | Industrial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 49  
Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 155  
Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member] | Finance Income [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 57  
Unregulated Operation Member | Other [Member] | Capacity [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 136  
Unregulated Operation Member | Product And Service Other [Member] | Other [Member] | Finance Income [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 30  
Unregulated Operation Member | Energy Marketing And Trading Margin [Member] | Other [Member] | Finance Income [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 115  
Unregulated Operation Member | Energy Commodities And Service [Member] | Other [Member] | Finance Income [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 293  
Unregulated Operation Member | Mark-to-market [Member] | Other [Member] | Finance Income [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 54  
Emera Florida And New Mexico Segment [Member] | Unregulated Operation Member | Product And Service Other [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 18  
Nova Scotia Power Inc Segment [Member] | Unregulated Operation Member | Product And Service Other [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Emera Maine Segment [Member] | Unregulated Operation Member | Product And Service Other [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Emera Caribbean Segment [Member] | Unregulated Operation Member | Product And Service Other [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Emera Energy Services [Member] | Unregulated Operation Member | Product And Service Other [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 614  
Corporate and Other [Member] | Unregulated Operation Member | Product And Service Other [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 47  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Electricity [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,384  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,384  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,384  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Other Electric and Regulatory Deferrals [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,384  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,384  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 1,384  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Commercial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 755  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 755  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 755  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Industrial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 209  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 209  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 209  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Other [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax [1] 10  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax [1] 10  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax [1] 10  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 492  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Commercial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 291  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Industrial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 49  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 155  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member] | Finance Income [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas [2],[3] 0  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Unregulated Operation Member | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 18  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Unregulated Operation Member | Other [Member] | Capacity [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Unregulated Operation Member | Energy Marketing And Trading Margin [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue [4] 0  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Unregulated Operation Member | Energy Commodities And Service [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Florida And New Mexico Segment [Member] | Unregulated Operation Member | Mark-to-market [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Electricity [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 731  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 731  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 731  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Other Electric and Regulatory Deferrals [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 731  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 731  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 731  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Commercial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 405  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 405  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 405  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Industrial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 233  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 233  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 233  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Other [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 28  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 28  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 28  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Commercial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Industrial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member] | Finance Income [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Unregulated Operation Member | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Unregulated Operation Member | Other [Member] | Capacity [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Unregulated Operation Member | Energy Marketing And Trading Margin [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Unregulated Operation Member | Energy Commodities And Service [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Nova Scotia Power Inc Segment [Member] | Unregulated Operation Member | Mark-to-market [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Electricity [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Other Electric and Regulatory Deferrals [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 107  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Commercial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 80  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 80  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 80  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Industrial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 16  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 16  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 16  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Other [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 66  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 66  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 66  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Commercial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Industrial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Maine Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member] | Finance Income [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Maine Segment [Member] | Unregulated Operation Member | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Maine Segment [Member] | Unregulated Operation Member | Other [Member] | Capacity [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Maine Segment [Member] | Unregulated Operation Member | Energy Marketing And Trading Margin [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Maine Segment [Member] | Unregulated Operation Member | Energy Commodities And Service [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Maine Segment [Member] | Unregulated Operation Member | Mark-to-market [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Electricity [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 154  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 154  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 154  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Other Electric and Regulatory Deferrals [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 154  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 154  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 154  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Commercial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 270  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 270  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 270  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Industrial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 30  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 30  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 30  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Electricity [Member] | Other [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 6  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 6  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 6  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Commercial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Industrial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member] | Finance Income [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Unregulated Operation Member | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Unregulated Operation Member | Other [Member] | Capacity [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Unregulated Operation Member | Energy Marketing And Trading Margin [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Unregulated Operation Member | Energy Commodities And Service [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Caribbean Segment [Member] | Unregulated Operation Member | Mark-to-market [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Electricity [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Electricity [Member] | Other Electric and Regulatory Deferrals [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Electricity [Member] | Commercial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Electricity [Member] | Industrial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Electricity [Member] | Other [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Oil And Gas Service [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Commercial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Industrial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Energy Services [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member] | Finance Income [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Emera Energy Services [Member] | Unregulated Operation Member | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Emera Energy Services [Member] | Unregulated Operation Member | Other [Member] | Capacity [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 136  
Operating Segments Member | Emera Energy Services [Member] | Unregulated Operation Member | Energy Marketing And Trading Margin [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 115  
Operating Segments Member | Emera Energy Services [Member] | Unregulated Operation Member | Energy Commodities And Service [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 309  
Operating Segments Member | Emera Energy Services [Member] | Unregulated Operation Member | Mark-to-market [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 54  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Electricity [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Electricity [Member] | Commercial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Electricity [Member] | Industrial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Electricity [Member] | Other [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Oil And Gas Service [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Commercial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Industrial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Operating Segments Member | Corporate and Other [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member] | Finance Income [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 57  
Operating Segments Member | Corporate and Other [Member] | Unregulated Operation Member | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 47  
Operating Segments Member | Corporate and Other [Member] | Unregulated Operation Member | Other [Member] | Capacity [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Corporate and Other [Member] | Unregulated Operation Member | Energy Marketing And Trading Margin [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Corporate and Other [Member] | Unregulated Operation Member | Energy Commodities And Service [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Operating Segments Member | Corporate and Other [Member] | Unregulated Operation Member | Mark-to-market [Member] | Other [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Electricity [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Electricity [Member] | Commercial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Electricity [Member] | Industrial [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Electricity [Member] | Other [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax (3)  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax (3)  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax (3)  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Electricity [Member] | Other [Member] | Other Electric and Regulatory Deferrals [Member]    
Regulated Operating Revenue Electric Non Nuclear Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Unregulated Operating Revenue Abstract    
Revenue From Contract With Customer Excluding Assessed Tax 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Oil And Gas Service [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Commercial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Industrial [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Intersegment Eliminations [Member] | Regulated Operation [Member] | Oil And Gas Service [Member] | Other [Member] | Finance Income [Member]    
Results Of Operations Revenue From Oil And Gas Producing Activities Abstract    
Regulated Operating Revenue, Gas 0  
Intersegment Eliminations [Member] | Unregulated Operation Member | Other [Member] | Capacity [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Intersegment Eliminations [Member] | Unregulated Operation Member | Product And Service Other [Member] | Other [Member] | Finance Income [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue (35)  
Intersegment Eliminations [Member] | Unregulated Operation Member | Energy Marketing And Trading Margin [Member] | Other [Member] | Finance Income [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue 0  
Intersegment Eliminations [Member] | Unregulated Operation Member | Energy Commodities And Service [Member] | Other [Member] | Finance Income [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue (16)  
Intersegment Eliminations [Member] | Unregulated Operation Member | Mark-to-market [Member] | Other [Member] | Finance Income [Member]    
Unregulated Operating Revenue Abstract    
Unregulated Operating Revenue $ 0  
[1]
Other includes an immaterial amount of rental revenues, which do not represent revenue from contracts with customers.
[2]
Revenue related to Brunswick Pipeline's service agreement with Repsol Energy Canada.
[3]
Revenue which does not represent revenues from contracts with customers.
[4]
Includes gains (losses) on settlement of energy related derivatives, which do not represent revenue from contracts with customers.