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Stock-based Compensation (Employee Common Share Purchase Plan and Dividend Reinvestment Plan) (Details) - CAD ($)
 12 Months Ended
Aug. 15, 2019
Dec. 31, 2019
Dec. 31, 2018
Employee Common Share Purchase Plan      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Employee Common Share Purchase Plan, Description   Eligible employees may participate in Emera’s Employee Common Share Purchase Plan. As of December 31, 2019, the plan allows employees to make cash contributions of a minimum of $25 to a maximum of $8,000 per year for the purpose of purchasing common shares of Emera. The Company also contributes to the plan a percentage of the employees’ contributions. If an employee contributes any amount up to $3,000 to the employee’s plan account, the Company will contribute 20 per cent of that amount. When an employee contributes any amount over $3,000, up to the $8,000 maximum, the Company will contribute 10 per cent of that amount. The plan allows the reinvestment of dividends.  
Defined Contribution Plan, Minimum Annual Contributions Per Employee, Amount   $ 25  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount   $ 8,000  
Maximum aggregate number of common shares reserved for issuance   4,000,000  
Compensation cost for shares issued   $ 1,000,000 $ 1,000,000
Employee Common Share Purchase Plan | Scenario Plan      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount   20,000  
Employee Common Share Purchase Plan | Minimum      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount   $ 3,000  
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   10.00%  
Employee Common Share Purchase Plan | Maximum      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount   $ 8,000  
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   20.00%  
Dividend Reinvestment Plan      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Employee Common Share Purchase Plan, Description   The Company also has a Common Shareholders Dividend Reinvestment and Share Purchase Plan (“Dividend Reinvestment Plan”) or (“DRIP”), which provides an opportunity for shareholders to reinvest dividends and purchase common shares. This plan provides for a discount of up to 5 per cent from the average market price of Emera’s common shares for common shares purchased in connection with the reinvestment of cash dividends. In 2019, the discount was changed from 5 per cent to 2 per cent effective with the dividend payment of August 15, 2019.  
Discount from Market Price, Purchase Date 2.00%    
Dividend Reinvestment Plan | Maximum      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Discount from Market Price, Purchase Date   5.00%