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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
$ / shares
shares
Dec. 31, 2022
CAD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
Stock option plan, Additional information        
Percentage of outstanding stock maximum 10.00%      
Dividend Reinvestment Plan        
Stock option plan, Additional information        
Maximum aggregate number of common shares reserved for issuance | shares 7.0      
Share Unit Plans        
Maximum aggregate number of common shares reserved for issuance | shares 7.0      
DSU Plan        
Share Unit Plans        
Cash payments made during the year $ 3,000 $ 8,000    
Employee Stock Option Plan        
Stock option plan, Additional information        
Maximum term 10 years      
Maximum aggregate number of common shares reserved for issuance | shares 6.0 6.0    
Terms of award P10Y      
Share Unit Plans        
Maximum aggregate number of common shares reserved for issuance | shares 6.0 6.0    
Share Unit Plans        
Stock option plan, Additional information        
Maximum aggregate number of common shares reserved for issuance | shares 2.0 2.7    
Share Unit Plans        
Maximum aggregate number of common shares reserved for issuance | shares 2.0 2.7    
First Anniversary | DSU Plan | Executive and senior management        
Stock option plan, Additional information        
Vesting rights, percentage 25.00%      
First Anniversary | DSU Plan | Executive and senior management | Minimum        
Stock option plan, Additional information        
Vesting rights, percentage 50.00%      
Vesting period after date of retirement | Employee Stock Option Plan        
Stock option plan, Additional information        
Vesting period       27 months
Vesting period after termination without just cause or death | Employee Stock Option Plan        
Stock option plan, Additional information        
Vesting period   6 months 6 months 6 months
Vesting period after termination for just cause or resignation | Employee Stock Option Plan        
Stock option plan, Additional information        
Vesting period   60 days 60 days 60 days
Stock Option Plan        
Stock option plan, Additional information        
Share-based payment award, description The Company has a stock option plan that grants options to senior management of the Company for a maximum term of 10 years. The option price of the stock options is the closing price of the Company’s common shares on the Toronto Stock Exchange on the last business day on which such shares were traded before the date on which the option is granted. The maximum aggregate number of shares issuable under this plan is 14.7 million shares. As at December 31, 2023, Emera was in compliance with this requirement. Stock options granted in 2021 and prior vest in 25 per cent increments on the first, second, third and fourth anniversaries of the date of the grant. Stock options granted in 2022 and thereafter vest in 20 per cent increments on the first, second, third, fourth and fifth anniversaries of the date of the grant. If an option is not exercised within 10 years, it expires and the optionee loses all rights thereunder. The holder of the option has no rights as a shareholder until the option is exercised and shares have been issued. The total number of stocks to be optioned to any optionee shall not exceed five per cent of the issued and outstanding common stocks on the date the option is granted.      
Maximum aggregate number of common shares reserved for issuance | shares 14.7      
Vesting rights The holder of the option has no rights as a shareholder until the option is exercised and shares have been issued.      
Percentage of outstanding stock maximum 5.00%      
Policy for issuing shares upon exercise The total number of stocks to be optioned to any optionee shall not exceed five per cent of the issued and outstanding common stocks on the date the option is granted.      
Cash received for options exercised $ 6,000 $ 9,000    
Total intrinsic value of options exercised $ 2,000 $ 4,000    
Exercise price range, lower range limit | $ / shares $ 32.35 $ 32.35    
Exercise price range, upper range limit | $ / shares $ 60.03 $ 60.03    
Fair value assumptions, method used The Company uses the Black-Scholes valuation model to estimate the compensation expense related to its stock-based compensation and recognizes the expense over the vesting period on a straight-line basis.      
Share Unit Plans        
Compensation cost recognized for employee and director $ 2,000 $ 2,000    
Maximum aggregate number of common shares reserved for issuance | shares 14.7      
Stock Option Plan, Granted 2021 | First Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage       25.00%
Stock Option Plan, Granted 2021 | Second Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage       25.00%
Stock Option Plan, Granted 2021 | Third Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage       25.00%
Stock Option Plan, Granted 2021 | Fourth Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage       25.00%
Stock Option Plan, Granted 2022 | First Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage   20.00% 20.00%  
Stock Option Plan, Granted 2022 | Second Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage   20.00% 20.00%  
Stock Option Plan, Granted 2022 | Third Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage   20.00% 20.00%  
Stock Option Plan, Granted 2022 | Fourth Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage   20.00% 20.00%  
Stock Option Plan, Granted 2022 | Fifth Anniversary        
Stock option plan, Additional information        
Vesting rights, percentage   20.00% 20.00%  
Share Unit Plans | Share Unit Plans        
Stock option plan, Additional information        
Share-based payment award, description The Company has DSU, PSU and RSU plans. The plans and the liabilities are marked-to-market at the end of each period based on an average common share price at the end of the period.      
Deferred Share Unit Plans        
Share Unit Plans        
Compensation cost recognized for employee and director $ 2,000 $ 6,000    
Tax expense related to compensation costs for share units realized 1,000 2,000    
Deferred Share Unit Plans | Employee        
Share Unit Plans        
Share Unit Plans: Aggregate intrinsic value 36,000 33,000    
Deferred Share Unit Plans | Director        
Share Unit Plans        
Share Unit Plans: Aggregate intrinsic value $ 37,000 34,000    
Deferred Share Unit Plans | Share Unit Plans | DSU Plan        
Share Unit Plans        
Deferred share unit plan, description When short-term incentive awards are determined, the amount elected is converted to DSUs, which have a value equal to the market price of an Emera common share. When a dividend is paid on Emera’s common shares, each participant’s DSU account is allocated additional DSUs equal in value to the dividends paid on an equivalent number of Emera common shares. Following termination of employment or retirement, and by December 15 of the calendar year after termination or retirement, the value of the DSUs credited to the participant’s account is calculated by multiplying the number of DSUs in the participant’s account by the average of Emera’s stock closing price for the fifty trading days prior to a given calculation date. Payments are made in cash. In addition, special DSU awards may be made from time to time by the Management Resources and Compensation Committee (“MRCC”), to selected executives and senior management to recognize singular achievements or by achieving certain corporate objectives.      
Deferred Share Unit Plans | Share Unit Plans | DSU Plan | Executive and senior management        
Share Unit Plans        
Deferred share unit plan, description Under the executive and senior management DSU plan, each participant may elect to defer all or a percentage of their annual incentive award in the form of DSUs with the understanding, for participants who are subject to executive share ownership guidelines, a minimum of 50 per cent of the value of their actual annual incentive award (25 per cent in the first year of the program) will be payable in DSUs until the applicable guidelines are met.      
Deferred Share Unit Plans | Share Unit Plans | DSU Plan | Director        
Share Unit Plans        
Deferred share unit plan, description Under the Directors’ DSU plan, Directors of the Company may elect to receive all or any portion of their compensation in DSUs in lieu of cash compensation, subject to requirements to receive a minimum portion of their annual retainer in DSUs. Directors’ fees are paid on a quarterly basis and, at the time of each payment of fees, the applicable amount is converted to DSUs. A DSU has a value equal to one Emera common share. When a dividend is paid on Emera’s common shares, the Director’s DSU account is credited with additional DSUs. DSUs cannot be redeemed for cash until the Director retires, resigns or otherwise leaves the Board. The cash redemption value of a DSU equals the market value of a common share at the time of redemption, pursuant to the plan. Following retirement or resignation from the Board, the value of the DSUs credited to the participant’s account is calculated by multiplying the number of DSUs in the participant’s account by Emera’s closing common share price on the date DSUs are redeemed.      
Performance Share Unit Plan        
Stock option plan, Additional information        
Award service period 3 years      
Share Unit Plans        
Tax expense related to compensation costs for share units realized $ 3,000 5,000    
Cash payments made during the year 19,000 24,000    
Performance Share Unit Plan | Employee        
Share Unit Plans        
Share Unit Plans: Aggregate intrinsic value $ 41,000 40,000    
Performance Share Unit Plan | Share Unit Plans        
Stock option plan, Additional information        
Share-based payment award, description Under the PSU plan, certain executive and senior employees are eligible for long-term incentives payable through the plan. PSUs are granted annually for three-year overlapping performance cycles, resulting in a cash payment. PSUs are granted based on the average of Emera’s stock closing price for the fifty trading days prior to the effective grant date. Dividend equivalents are awarded and paid in the form of additional PSUs. The PSU value varies according to the Emera common share market price and corporate performance. PSUs vest at the end of the three-year cycle and the payouts will be calculated and approved by the MRCC early in the following year. The value of the payout considers actual service over the performance cycle and may be pro-rated in certain departure scenarios. In the case of retirement, as defined in the PSU plan, grants may continue to vest in full and payout in normal course post-retirement.      
Compensation cost recognized for stock options $ 11,000 18,000    
Restricted Share Unit Plan        
Stock option plan, Additional information        
Award service period 3 years      
Share Unit Plans        
Tax expense related to compensation costs for share units realized $ 3,000   $ 2  
Share Unit Plans: Aggregate intrinsic value 32,000      
Cash payments made during the year $ 10,000    
Restricted Share Unit Plan | Employee        
Share Unit Plans        
Share Unit Plans: Aggregate intrinsic value   30,000    
Restricted Share Unit Plan | Share Unit Plans        
Stock option plan, Additional information        
Share-based payment award, description Under the RSU plan, certain executive and senior employees are eligible for long-term incentives payable through the plan. RSUs are granted annually for three-year overlapping performance cycles, resulting in a cash payment. RSUs are granted based on the average of Emera’s stock closing price for the fifty trading days prior to the effective grant date. Dividend equivalents are awarded and paid in the form of additional RSUs. The RSU value varies according to the Emera common share market price. RSUs vest at the end of the three-year cycle and the payouts will be calculated and approved by the MRCC early in the following year. The value of the payout considers actual service over the performance cycle and may be pro-rated in certain departure scenarios. In the case of retirement, as defined in the RSU plan, grants may continue to vest in full and payout in normal course post-retirement.      
Compensation cost recognized for stock options $ 10,000 $ 9,000