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Employee Benefit Plans (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined-Benefit Plans, information      
Defined Benefit Plan, Description Emera maintains a number of contributory defined-benefit and defined-contribution pension plans, which cover substantially all of its employees. In addition, the Company provides non-pension benefits for its retirees. These plans cover employees in Nova Scotia, New Brunswick, Newfoundland and Labrador, Florida, New Mexico, Barbados, Dominica and Grand Bahama Island.    
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description The market-related value of assets is based on a five-year smoothed asset value. Any investment gains (or losses) in excess of (or less than) the expected return on plan assets are recognized on a straight-line basis into the market-related value of assets over a five-year period.    
Defined Benefit Plan, Plan Assets, Expected Long-term Rate-of-Return, Description The expected long-term rate of return on plan assets is based on historical and projected real rates of return for the plan’s current asset allocation, and assumed inflation. A real rate of return is determined for each asset class. Based on the asset allocation, an overall expected real rate of return for all assets is determined. The asset return assumption is equal to the overall real rate of return assumption added to the inflation assumption, adjusted for assumed expenses to be paid from the plan.    
Defined Benefit Plan, Expected Return on Plan Assets $ 2,476 $ 2,401  
Contribution Amount 45 34  
Defined benefit pension plans      
Defined-Benefit Plans, information      
Defined Benefit Plan, Expected Return on Plan Assets 141 147  
Defined Benefit Plan, Fair Value of Plan Assets 2,605 2,593 $ 2,300
Non-pension Benefit Plans      
Defined-Benefit Plans, information      
Defined Benefit Plan, Expected Return on Plan Assets 1 2  
Defined Benefit Plan, Fair Value of Plan Assets $ 52 $ 56 $ 49