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Long Term Debt (Narrative) (Details) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 29, 2016 USD ($) | Apr. 10, 2015 | Jun. 30, 2016 | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD | Dec. 31, 2016 USD ($) | Jun. 16, 2016 CAD | Jun. 16, 2016 USD ($) | May 27, 2016 CAD | Apr. 29, 2016 CAD | May 20, 2015 USD ($) | Apr. 11, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | CAD 1,762,000,000 | CAD 18,000,000 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | 354,000,000 | 9,000,000 |  |  |  |  |  |  |
Emera Inc |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 2,366,000,000 | 715,000,000 |  |  |  |  |  |  |
Emera Inc | Medium-term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 2.96% | 2.96% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | CAD 250,000,000 |  |  |  |  |
Emera Inc | Hybrid Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 6.75% | 6.75% |  |  |  |
Debt Instrument, Face Amount | $ |  |  |  |  |  |  |  | $ 1,200 |  |  |  |
Emera Inc | Hybrid Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 100.00% |  |  |  |  |  |  |  |  |
Emera Inc | Hybrid Notes, 2026 through 2046 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 5.44% |  |  |  |  |  |  |  |  |
Emera Inc | Hybrid Notes, 2046 through 2076 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 6.19% |  |  |  |  |  |  |  |  |
Emera Inc | Canadian Notes [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 2.90% | 2.90% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | CAD 500,000,000 |  |  |  |  |
Nova Scotia Power Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 2,324,000,000 | 2,430,000,000 |  |  |  |  |  |  |
Nova Scotia Power Inc. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | CAD 600,000,000 |  |
Line of credit current borrowing capacity |  |  |  |  |  |  |  |  |  | CAD 500,000,000 |  |
Nova Scotia Power Inc. [Member] | Commercial Paper [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | CAD 500,000,000 |  |  |
Line of credit current borrowing capacity |  |  |  |  |  |  |  |  | CAD 400,000,000 |  |  |
Nova Scotia Power Inc. [Member] | Medium-term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | CAD 1,965,000,000 | 1,965,000,000 |  |  |  |  |  |  |
Emera Brunswick Pipeline Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.08% |  | 3.08% |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Dec. 31, 2019 |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | CAD 248,000,000 | 249,000,000 |  |  |  |  |  |  |
Emera US Finance LP [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 4,364,000,000 | 0 |  |  |  |  |  |  |
Emera US Finance LP [Member] | U.S. Notes [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ |  |  |  |  |  |  |  | $ 3,250 |  |  |  |
Emera US Finance LP [Member] | U.S. Notes, Due 2019 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 2.15% | 2.15% |  |  |  |
Debt Instrument, Face Amount | $ |  |  |  |  |  |  |  | $ 500 |  |  |  |
Emera US Finance LP [Member] | U.S. Notes, Due 2021 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 2.70% | 2.70% |  |  |  |
Debt Instrument, Face Amount | $ |  |  |  |  |  |  |  | $ 750 |  |  |  |
Emera US Finance LP [Member] | U.S. Notes, Due 2026 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.55% | 3.55% |  |  |  |
Debt Instrument, Face Amount | $ |  |  |  |  |  |  |  | $ 750 |  |  |  |
Emera US Finance LP [Member] | U.S. Notes, Due 2046 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.75% | 4.75% |  |  |  |
Debt Instrument, Face Amount | $ |  |  |  |  |  |  |  | $ 1,250 |  |  |  |
Tampa Electric Division [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 2,579,000,000 | 0 |  |  |  |  |  |  |
Tampa Electric Division [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | CAD 436,000,000 |  | $ 325 |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Dec. 17, 2018 |  |  |  |  |  |  |  |
Tampa Electric Division [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 0 |  |  |  |  |  |  |
TECO Finance, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | CAD 1,141,000,000 | CAD 0 |  |  |  |  |  |  |
TECO Finance, Inc. [Member] | Floating rate notes due 2018 [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit current borrowing capacity | $ |  |  |  |  |  |  |  |  |  |  |  | $ 250
TECO Finance, Inc. [Member] | Notes due 2045 [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.60% |  |  |  |  |  |  |  |  |  |
ECI [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit current borrowing capacity | $ | $ 150 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date | Nov. 29, 2021 |  |  |  |  |  |  |  |  |  |  |
ECI [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 4.08% |  |  |  |  |  |  |  |  |  |  |
ECI [Member] | Notes due 2045 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 4.20% |
Debt Instrument, Face Amount | $ |  |  |  |  |  |  |  |  |  |  | $ 250 |

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