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Long-Term Debt (Narrative) (Details) $ in Millions, $ in Millions, $ in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2024 CAD ($) | Jul. 30, 2024 USD ($) | Jul. 12, 2024 USD ($) | Jun. 24, 2024 CAD ($) | Jun. 18, 2024 USD ($) | Jun. 15, 2024 USD ($) | May 02, 2024 USD ($) | Feb. 16, 2024 CAD ($) | Jan. 30, 2024 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Jul. 19, 2024 CAD ($) | Jun. 13, 2024 CAD ($) | May 02, 2024 BBD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  |  | $ 1,086 | $ 151 |  |  |
TEC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |
Senior unsecured bonds due March 1, 2029 | TEC | Florida Electric Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  | Mar. 01, 2029 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 4.90% |  |  |  |  |
Debt term |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Unsecured non-revolving credit facility due June 24, 2025 | NSPI | Canadian Electric Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 300 |  |  |  |  |  |  | $ 400 |  |  |
Maturity date |  |  |  | Jun. 24, 2025 |  |  |  |  |  |  | Jul. 15, 2024 |  |  |
Repayment of long-term debt | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured committed revolving credit facility due June 24, 2029 | NSPI | Canadian Electric Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  | Jun. 24, 2029 |  |  |  |  |  |  | Dec. 16, 2027 |  |  |
Unsecured committed revolving credit facility due June 24, 2029 | Emera | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 1,300 |  |  |  |  |  |  | $ 900 |  |  |
Maturity date |  |  |  | Jun. 24, 2029 |  |  |  |  |  |  | Jun. 24, 2027 |  |  |
Non-revolving credit facility due 2047 | NSPI | Canadian Electric Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 120 |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.51% |
Debt term |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Percentage of total eligible project costs available under credit facility |  |  |  | 45.06% |  |  |  |  |  |  |  |  |  |
Period of facility available after completion of project |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |
Non-revolving term credit facility, expiration date |  |  |  | May 21, 2027 |  |  |  |  |  |  |  |  |  |
Amount utilized under credit facility |  |  |  |  |  |  |  |  |  | $ 19 |  |  |  |
Fixed rate notes and bonds | NMGI | Gas Utilities and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  | $ 150 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loan notes due July 19, 2028 | BPLC | Other Electric Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 46 |  |  |  |  |  |  | $ 92
Maturity date |  |  |  |  |  |  | Jul. 19, 2028 |  |  |  | Feb. 19, 2025 |  |  |
Unsecured senior notes | Emera Finance | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |
Fixed-to-fixed reset rate junior subordinated notes | EUSHI Finance, Inc [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Dec. 15, 2054 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 7.625% |  |  |  |  |  |  |  |  |
Term of reset |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  | 3.136% |  |  |  |  |  |  |  |  |
Period before reset date where notes may be redeemed |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |
Unsecured non-revolving facility February 19, 2024 | Emera | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  | Feb. 19, 2024 |  |  |
Unsecured non-revolving facility February 19, 2025 | Emera | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 400 |  |  |  | $ 200 |  |
Maturity date |  |  |  |  |  |  |  | Feb. 19, 2025 |  |  |  |  |  |

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