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v3.21.1

Long Term Debt (Narrative) (Details) $ in Millions, $ in Millions, $ in Millions, $ in Millions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 05, 2021 USD ($) | May 20, 2020 USD ($) | Apr. 24, 2020 CAD ($) | Mar. 13, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 BBD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | May 20, 2020 BSD ($) | May 20, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 2,463 |  | $ 2,677 |  |  |
Proceeds from issuance of long-term debt |  |  |  |  | $ 428 | 1,066 |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | $ 513 | 1,103 |  |  |  |  |
Emera |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 2,496 |  | 2,291 |  |  |
NSPI |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, available for issuance under this prospectus |  |  | $ 300 |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Apr. 25, 2050 |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.31% |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | $ 2,673 |  | $ 2,956 |  |  |
NMGC | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior notes | $ 220 |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt | $ 200 |  |  |  |  |  |  |  |  |  |
TECO Finance |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | $ 300 |  |  |  |  |  |  |
Non-revolving term loan | GBPC |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | $ 22
Line of Credit Facility, Expiration Date |  | May 20, 2025 |  |  |  |  |  |  |  |  |
Variable rate |  | 90-day LIBOR plus a margin |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 5 years |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 22 |  |  |  |  |  |  |  |  |
Non-revolving term loan | BPLC |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 110 |  | $ 55 |  |
Stated interest rate |  |  |  |  |  |  | 2.05% | 2.05% | 2.05% |  |
Long-term Debt, Gross |  |  |  |  |  |  | $ 77 |  | $ 38 |  |
Non-revolving term loan at 4% interest rate | GBPC |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  | May 20, 2025 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 15 | $ 15
Stated interest rate |  |  |  |  |  |  |  |  |  | 4.00% | 4.00%
Senior note maturity date of February 5, 2031 | NMGC | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Feb. 05, 2031 |  |  |  |  |  |  |  |  |  |
Stated interest rate | 2.26% |  |  |  |  |  |  |  |  |  |
Senior notes | $ 70 |  |  |  |  |  |  |  |  |  |
Senior note maturity date of February 5, 2036 | NMGC | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Feb. 05, 2036 |  |  |  |  |  |  |  |  |  |
Stated interest rate | 2.51% |  |  |  |  |  |  |  |  |  |
Senior notes | $ 65 |  |  |  |  |  |  |  |  |  |
Senior note maturity date of February 5, 2051 | NMGC | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Feb. 05, 2051 |  |  |  |  |  |  |  |  |  |
Stated interest rate | 3.34% |  |  |  |  |  |  |  |  |  |
Senior notes | $ 85 |  |  |  |  |  |  |  |  |  |

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