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Long Term Debt (Credit Facilities) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,635 $ 1,624
Long-term Line of Credit 899 598
Letters of Credit Outstanding, Amount 77 44
Use Of Available Facilities 976 642
Line of Credit Facility, Remaining Borrowing Capacity 659 982
Emera Inc | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 900 900
Line of Credit Facility, Expiration Date Jun. 30, 2020  
Overdraft limit on lines of credit accounts   $ 50
Nova Scotia Power Inc. [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Expiration Date Oct. 01, 2023 Oct. 01, 2021
Nova Scotia Power Inc. [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 600 $ 600
Line of Credit Facility, Expiration Date Oct. 31, 2023  
Overdraft limit on lines of credit accounts   50
Emera Maine [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 109 100
Line of Credit Facility, Expiration Date Feb. 28, 2023  
The Barbados Light and Power Company Limited [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 26 $ 24
The Barbados Light and Power Company Limited [Member] | Revolving Credit Facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Expiration Date Dec. 31, 2022  
The Barbados Light and Power Company Limited [Member] | Revolving Credit Facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Expiration Date Dec. 31, 2021