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Employee Benefit Plans (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined-Benefit Plans, information    
Defined Benefit Plan, Description Emera maintains a number of contributory defined-benefit (“DB”) and defined-contribution (“DC”) 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, 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 $ 2,577 $ 2,482
Contribution Amount $ 45 41
Plan assets recognition period 5 years  
Defined benefit pension plans    
Defined-Benefit Plans, information    
Defined Benefit Plan, Expected Return on Plan Assets $ 161 144
Non-pension Benefit Plans    
Defined-Benefit Plans, information    
Defined Benefit Plan, Expected Return on Plan Assets $ 2 $ 0