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Long Term Debt (Narrative) (Details) $ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 12, 2017 CAD ($) | Oct. 11, 2017 BBD ($) | Oct. 11, 2017 USD ($) | Sep. 27, 2017 USD ($) | Sep. 01, 2017 BBD ($) | Sep. 01, 2017 USD ($) | Mar. 22, 2017 USD ($) | Mar. 21, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 682 |  | $ 354 |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt | $ 453 |  | $ 273 |  |  |  |  |  |  |  |  |
Senior secured credit facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Feb. 01, 2021 | Feb. 01, 2021 | Feb. 01, 2019 |  |  |  |  |  |  |  |  |
Emera Inc |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 900 |  |  |  |  |  |  |
Long-term Debt, Gross | $ 2,363 |  | $ 2,366 |  |  |  |  |  |  |  |  |
Nova Scotia Power Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 2,424 |  | 2,324 |  |  |  |  |  |  |  |  |
Nova Scotia Power Inc. [Member] | Medium-term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 1,965 |  | $ 1,965 |  |  |  |  |  |  |  |  |
Nova Scotia Power Inc. [Member] | Line of Credit [Member] | Revolving term credit facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date | Oct. 01, 2021 | Oct. 01, 2021 | Oct. 01, 2020 |  |  |  |  |  |  |  |  |
Capitalization ratio | 0.70% | 0.70% | 0.65% |  |  |  |  |  |  |  |  |
Emera Brunswick Pipeline Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 248 |  | $ 248 |  |  |  |  |  |  |  |  |
Emera US Finance LP [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 4,077 |  | 4,364 |  |  |  |  |  |  |  |  |
Tampa Electric Division [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 2,410 |  | 2,579 |  |  |  |  |  |  |  |  |
TECO Finance, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 690 |  | $ 1,141 |  |  |  |  |  |  |  |  |
TECO Finance, Inc. [Member] | U.S. Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 300 |  |  |  |  |  |  |  |  |  |
The Barbados Light And Power Company Limited [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 20 |  |
The Barbados Light And Power Company Limited [Member] | BLPC BBD Secured fixed rate senior notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.65% |  |  |  |  |  | 4.25% | 4.25% |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 20 |  |  |
Debt Instrument, Maturity Date | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 |  |  |  |  |  |  |  |  |
The Barbados Light And Power Company Limited [Member] | BLPC BBD Secured fixed rate senior notes [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 687.50% |  |  |  |  |  | 5.875% | 5.875% |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 20 |  |  |
Debt Instrument, Maturity Date | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2020 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 20 |  |
The Barbados Light And Power Company Limited [Member] | BBD Demand loan facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.50% |  |  | 4.00% | 4.00% |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 12 |  |  |  |  |  |
The Barbados Light And Power Company Limited [Member] | BBD Demand loan facility [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 12 |  |  |  |  |
Emera Maine [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 408 |  | $ 380 |  |  |  |  |  |  |  |  |
Emera Maine [Member] | USD senior unsecured notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 436.00% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 50 |  |  |  |
Debt Instrument, Maturity Date | Sep. 27, 2047 | Sep. 27, 2047 |  |  |  |  |  |  |  |  |  |
Grand Bahama Power Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 166 |  | 130 |  |  |  |  |  |  |  |  |
Grand Bahama Power Company Limited [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | $ 45
New Mexico Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 363 | $ 339 |  |  |  |  |  |  |  |
New Mexico Gas Company [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | $ 125 |
Line of Credit Facility, Expiration Date | Mar. 22, 2022 | Mar. 22, 2022 | Dec. 17, 2018 |  |  |  |  |  |  |  |  |

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