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Long Term Debt (Long-term Debt) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 CAD	Dec. 31, 2015 CAD	Dec. 31, 2016 USD ($)	Dec. 13, 2016 CAD	Jun. 16, 2016 CAD	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Fair Market Value Adjustments to Debt		CAD 0		CAD 58,000,000
Debt issuance costs		(16,000,000)		(111,000,000)
Amount due within one year		(274,000,000)		(476,000,000)
Long Term Debt, Adjustments		(290,000,000)		(529,000,000)
Long-term Debt and Capital Lease Obligations		3,735,000,000		CAD 14,268,000,000
Emera Inc
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 2,366,000,000	CAD 715,000,000
Emera Inc | Bankers Acceptances, LIBOR Loans [Member]
Debt Instrument [Line Items]
Variable rate	Variable	Variable
Long-term Debt, Gross	CAD 30,000,000	CAD 240,000,000
Debt Instrument, Maturity Date	Dec. 31, 2020
Emera Inc | Unsecured fixed rate notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 725,000,000	CAD 475,000,000
Emera Inc | Unsecured fixed rate notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.50%		3.50%
Debt Instrument, Maturity Date	Dec. 31, 2019
Emera Inc | Unsecured fixed rate notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.85%		3.85%
Debt Instrument, Maturity Date	Dec. 31, 2024
Emera Inc | Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					2.96%
Debt Instrument, Face Amount					CAD 250,000,000
Emera Inc | Fixed to floating subordinated notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate	6.75%		6.75%
Long-term Debt, Gross	CAD 1,611,000,000	CAD 0
Debt Instrument, Maturity Date	Dec. 31, 2076
Emera US Finance LP [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 4,364,000,000	CAD 0
Emera US Finance LP [Member] | Unsecured senior notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.60%		3.60%
Long-term Debt, Gross	CAD 4,364,000,000	CAD 0
Emera US Finance LP [Member] | Unsecured senior notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2019
Emera US Finance LP [Member] | Unsecured senior notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2046
TECO Finance, Inc. [Member]
Debt Instrument [Line Items]
Variable rate	Variable
Long-term Debt, Gross	CAD 1,141,000,000	0
TECO Finance, Inc. [Member] | Unsecured Debt [Member] | Unsecured Notes, 4.00% [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 336,000,000	0
TECO Finance, Inc. [Member] | Unsecured Debt [Member] | Unsecured Notes, 6.57% [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.86%		5.86%
Long-term Debt, Gross	CAD 805,000,000	0
TECO Finance, Inc. [Member] | Variable rate notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2018
TECO Finance, Inc. [Member] | Fixed rate notes and bonds [Member]
Debt Instrument [Line Items]
Weighted average interest rate	5.86%		5.86%
Long-term Debt, Gross	CAD 805,000,000	0
TECO Finance, Inc. [Member] | Fixed rate notes and bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2017
TECO Finance, Inc. [Member] | Fixed rate notes and bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2020
Tampa Electric Division [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 2,579,000,000	0
Tampa Electric Division [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		0
Tampa Electric Division [Member] | Senior Notes [Member] | Unsecured Notes, Floating Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | $			$ 86.0
Tampa Electric Division [Member] | Senior Notes [Member] | Senior Unsecured Note I [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | $			51.6
Tampa Electric Division [Member] | Senior Notes [Member] | Senior Secured Notes I [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | $			$ 75.0
Tampa Electric Division [Member] | Fixed rate notes and bonds [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.90%		4.90%
Long-term Debt, Gross	CAD 2,579,000,000	0
Tampa Electric Division [Member] | Fixed rate notes and bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2018
Tampa Electric Division [Member] | Fixed rate notes and bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2045
Peoples Gas System Division [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 351,000,000	CAD 0
Peoples Gas System Division [Member] | Fixed rate notes and bonds [Member]
Debt Instrument [Line Items]
Weighted average interest rate	5.06%		5.06%
Long-term Debt, Gross	CAD 351,000,000	CAD 0
Peoples Gas System Division [Member] | Fixed rate notes and bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2018
Peoples Gas System Division [Member] | Fixed rate notes and bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2045
New Mexico Gas Company [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 363,000,000	0
New Mexico Gas Company [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		CAD 0
New Mexico Gas Company [Member] | Fixed rate notes and bonds [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.53%		4.53%
Long-term Debt, Gross	CAD 363,000,000	CAD 0
New Mexico Gas Company [Member] | Fixed rate notes and bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2021
New Mexico Gas Company [Member] | Fixed rate notes and bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2026
New Mexico Gas Incorporate [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 269,000,000	0
New Mexico Gas Incorporate [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		CAD 0
New Mexico Gas Incorporate [Member] | Fixed rate notes and bonds [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.41%		3.41%
Long-term Debt, Gross	CAD 269,000,000	CAD 0
New Mexico Gas Incorporate [Member] | Fixed rate notes and bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2019
New Mexico Gas Incorporate [Member] | Fixed rate notes and bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2024
Nova Scotia Power Inc. [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 2,324,000,000	CAD 2,430,000,000
Nova Scotia Power Inc. [Member] | Commercial Paper [Member]
Debt Instrument [Line Items]
Variable rate	Variable	Variable
Long-term Debt, Gross	CAD 264,000,000	CAD 369,000,000
Debt Instrument, Maturity Date	Dec. 31, 2020
Nova Scotia Power Inc. [Member] | Medium-term Notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate	5.73%	5.73%	5.73%			5.73%
Long-term Debt, Gross	CAD 1,965,000,000	CAD 1,965,000,000
Nova Scotia Power Inc. [Member] | Medium-term Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2019
Nova Scotia Power Inc. [Member] | Medium-term Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2097
Nova Scotia Power Inc. [Member] | Medium-term Notes [Member] | Series F [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.75%		9.75%
Long-term Debt, Gross	CAD 95,000,000	CAD 95,000,000
Debt Instrument, Maturity Date	Dec. 31, 2019
Nova Scotia Power Inc. [Member] | Fixed rate debenture [Member]
Debt Instrument [Line Items]
Weighted average interest rate	9.75%	9.75%	9.75%			9.75%
Long-term Debt, Gross	CAD 95,000,000	CAD 95,000,000
Debt Instrument, Maturity Date	Dec. 31, 2019
Nova Scotia Power Inc. [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 0	1,000,000
Debt Instrument, Maturity Date	Dec. 31, 2019
Emera Maine [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross | $			$ 380.0			$ 397.0
Emera Maine [Member] | LIBOR loans and demand loans [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 32,000,000	32,000,000
Emera Maine [Member] | General & Refunding Mortgage Bonds I [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.28%		4.28%
Long-term Debt, Gross	CAD 281,000,000	CAD 296,000,000
Debt Instrument, Face Amount | $			$ 20.0
Emera Maine [Member] | Loans Payable [Member] | LIBOR loans and demand loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2019
Emera Maine [Member] | LIBOR loans and demand loans [Member]
Debt Instrument [Line Items]
Variable rate	Variable	Variable
Long-term Debt, Gross | $			$ 32.0			$ 32.0
Debt Instrument, Maturity Date	Dec. 31, 2019
Emera Maine [Member] | Secured fixed rate mortgage bonds [Member]
Debt Instrument [Line Items]
Weighted average interest rate	9.74%	9.74%	9.74%			9.74%
Long-term Debt, Gross | $			$ 67.0			$ 69.0
Emera Maine [Member] | Secured fixed rate mortgage bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2020
Emera Maine [Member] | Secured fixed rate mortgage bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2022
Emera Maine [Member] | Unsecured senior fixed rate notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.28%	4.31%	4.28%			4.31%
Long-term Debt, Gross | $			$ 281.0			$ 296.0
Emera Maine [Member] | Unsecured senior fixed rate notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2017
Emera Maine [Member] | Unsecured senior fixed rate notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2044
Emera Brunswick Pipeline Company Limited [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.08%		3.08%
Long-term Debt, Gross	CAD 248,000,000	CAD 249,000,000
Debt Instrument, Maturity Date	Dec. 31, 2019
Emera Brunswick Pipeline Company Limited [Member] | Secured senior notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.08%	3.08%	3.08%			3.08%
Long-term Debt, Gross	CAD 248,000,000	CAD 249,000,000
Emera Brunswick Pipeline Company Limited [Member] | Senior secured credit facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2019
Grand Bahama Power Company Limited [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross | $			$ 130.0			$ 145.0
Grand Bahama Power Company Limited [Member] | Unsecured Debt [Member] | Unsecured Notes I [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.62%		3.62%
Long-term Debt, Gross	CAD 63,000,000	77,000,000
Grand Bahama Power Company Limited [Member] | Unsecured Debt [Member] | Unsecured Notes II [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.07%		7.07%
Long-term Debt, Gross	CAD 67,000,000	CAD 68,000,000
Grand Bahama Power Company Limited [Member] | Unsecured amortizing fixed rate notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.62%	3.62%	3.62%			3.62%
Long-term Debt, Gross | $			$ 63.0			$ 77.0
Grand Bahama Power Company Limited [Member] | Unsecured amortizing fixed rate notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2021
Grand Bahama Power Company Limited [Member] | Unsecured amortizing fixed rate notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2022
Grand Bahama Power Company Limited [Member] | Unsecured senior notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate	7.07%	7.07%	7.07%			7.07%
Long-term Debt, Gross | $			$ 67.0			$ 68.0
Grand Bahama Power Company Limited [Member] | Unsecured senior notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2020
Grand Bahama Power Company Limited [Member] | Unsecured senior notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2023
The Barbados Light & Power Company Limited And Emera Caribbean Incorporated [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross | $			282.0			89.0
The Barbados Light & Power Company Limited And Emera Caribbean Incorporated [Member] | Senior Notes [Member] | Senior Secured Notes I [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	CAD 201,000,000	CAD 0
Debt Instrument, Maturity Date	Dec. 31, 2021
The Barbados Light & Power Company Limited And Emera Caribbean Incorporated [Member] | Secured senior notes [Member]
Debt Instrument [Line Items]
Variable rate	Variable
Long-term Debt, Gross | $			$ 201.0			$ 0.0
Debt Instrument, Maturity Date	Dec. 31, 2021
The Barbados Light & Power Company Limited And Emera Caribbean Incorporated [Member] | Secured fixed rate senior notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate	5.65%	5.64%	5.65%			5.64%
Long-term Debt, Gross | $			$ 81.0			$ 89.0
The Barbados Light & Power Company Limited And Emera Caribbean Incorporated [Member] | Secured fixed rate senior notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2020
The Barbados Light & Power Company Limited And Emera Caribbean Incorporated [Member] | Secured fixed rate senior notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2028

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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