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Stock-Based Compensation (Employee Common Share Purchase Plan and Common Shareholders Dividend Reinvestment and Share Purchase Plan) (Narrative) (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2024 CAD ($) $ / mo shares | Dec. 31, 2024 USD ($) $ / mo shares | Dec. 31, 2023 CAD ($)
Employee Common Share Purchase Plan |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Employee Common Share Purchase Plan, Description | Eligible employees can participate in the ECSPP. As of December 31, 2024, the plan allows employees to make cash contributions of a minimum of $25 per month to a maximum of $20,000 CAD or $15,000 USD per year for the purpose of purchasing common shares of Emera. The Company also contributes 20 per cent of the employees’ contributions to the plan. The plan allows reinvestment of dividends for all participants except for where prohibited by law. | Eligible employees can participate in the ECSPP. As of December 31, 2024, the plan allows employees to make cash contributions of a minimum of $25 per month to a maximum of $20,000 CAD or $15,000 USD per year for the purpose of purchasing common shares of Emera. The Company also contributes 20 per cent of the employees’ contributions to the plan. The plan allows reinvestment of dividends for all participants except for where prohibited by law. |
Defined Contribution Plan, Minimum Annual Contributions Per Employee, Amount | $ / mo | 25 | 25 |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | $ 20,000 | $ 15,000 |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 20.00% | 20.00% |
Compensation cost for shares issued | $ | $ 4,000,000 |  | $ 3,000,000
Dividend Reinvestment Plan |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Employee Common Share Purchase Plan, Description | The Company also has a Common Shareholders DRIP, which provides an opportunity for shareholders residing in Canada 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 with the reinvestment of cash dividends. The discount was 2 per cent in 2024. | The Company also has a Common Shareholders DRIP, which provides an opportunity for shareholders residing in Canada 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 with the reinvestment of cash dividends. The discount was 2 per cent in 2024. |
Maximum aggregate number of common shares reserved for issuance | shares | 7 | 7 |
Discount from Market Price, Purchase Date | 2.00% | 2.00% |
Dividend Reinvestment Plan | Maximum |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Discount from Market Price, Purchase Date | 5.00% | 5.00% |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Description of the plan, including the basis for determining contributions, the employee groups covered, and the nature and effect of significant matters affecting comparability of information for all periods presented. For leveraged ESOPs and pension reversion ESOPs, the description generally includes the basis for releasing shares and how dividends on allocated and unallocated shares are used. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480489/718-40-50-1 + Details
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