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v3.20.1

Long Term Debt (Narrative) (Details) $ in Millions, $ in Millions |  |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2019 CAD ($) | Dec. 02, 2019 CAD ($) | Aug. 02, 2019 CAD ($) | Jul. 31, 2019 CAD ($) | Jul. 24, 2019 CAD ($) | Jun. 14, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 10, 2019 USD ($) | Jun. 13, 2019 CAD ($) | May 17, 2019 CAD ($) | Apr. 04, 2019 CAD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock |  |  |  |  |  |  | $ 0 | $ 291 |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  | 1,066 | 1,055 |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  | 1,103 | 757 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | 2,463 | 2,065 |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  | 203 | 10 |  |  |  |
Emera |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  | $ 500 |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 900 |  |
Long-term Debt, Gross |  |  |  |  |  |  | 2,496 | 2,701 |  |  |  |
Tampa Electric Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | 3,334 | 3,126 |  |  |  |
NSPI |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 95 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | 2,673 | 2,576 |  |  |  |
NMGC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | 474 | 368 |  |  |  |
NMGI |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | 195 | 273 |  |  |  |
Emera Maine |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | 518 | 478 |  |  |  |
ECI |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | 470 | 464 |  |  |  |
EBP |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | $ 248 | $ 248 |  |  |  |
Series G Preferred Stock | Emera |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 4.83% |  |  |  |  |
Repayments of Long-term Debt |  | $ 225 |  |  |  |  |  |  |  |  |  |
Revolving credit facility | EBP |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | $ 250 |
USD 30-year senior notes, Due 2050 | Tampa Electric Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  | $ 300 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.625% |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  | Jun. 15, 2050 |  |  |  |  |
USD Note | NMGI |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | $ 50 |  |  |  |  |  |  |  |
USD 30-year senior notes, Due 2049 | NSPI |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, available for issuance under this prospectus |  |  |  |  |  |  |  |  |  |  |  | $ 400
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.57%
Debt Instrument, Maturity Date |  |  |  |  |  |  | Apr. 05, 2049 |  |  |  |  |
USD 30-year senior notes, Due 2049 | NMGC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt | $ 80 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.72% |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  | Dec. 15, 2049 |  |  |  |  |
USD 30-year senior notes, Due 2048 | Emera Maine |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, available for issuance under this prospectus |  |  |  |  |  |  |  |  | $ 60 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.79% |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  | Dec. 10, 2049 |  |  |  |  |
USD 15-year senior notes, Due 2034 | NMGC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt | $ 15 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.24% |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  | Dec. 15, 2034 |  |  |  |  |

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