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Short Term Debt (short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity) (Details) - CAD CAD in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 13, 2016 | Dec. 31, 2015
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD 1,762 |  | CAD 18
Letters of Credit Outstanding, Amount |  | CAD 37 | 33
Total advances under available facilities |  | 363 | 674
Available capacity under existing agreements |  | 1,070 | 663
Long-term Line of Credit |  | CAD 326 | CAD 641
Short-term Debt, Weighted Average Interest Rate | 1.73% |  | 2.70%
Short term debt revolving and non revolving credit facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Credit Facility Advances | CAD 960 |  | CAD 0
Letters of Credit Outstanding, Amount | 3 |  | 0
Total advances under available facilities | 963 |  | 0
Available capacity under existing agreements | 799 |  | 18
TECO Energy Inc. and TECO Finance Inc. [Member] | Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD 403 |  | CAD 0
Line of Credit Facility, Expiration Date | Dec. 31, 2018 |  |
TECO Energy Inc. and TECO Finance Inc. [Member] | Line of Credit [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term Debt, Weighted Average Interest Rate | 1.74% |  | 0.00%
TECO Energy Inc. and TECO Finance Inc. [Member] | Finance Term Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD 537 |  | CAD 0
Line of Credit Facility, Expiration Date | Dec. 31, 2017 |  |
Tampa Electric Division [Member] | Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD 436 |  | 0
Line of Credit Facility, Expiration Date | Dec. 31, 2018 |  |
Tampa Electric Division [Member] | Accounts Receivable Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD 201 |  | CAD 0
Line of Credit Facility, Expiration Date | Dec. 31, 2018 |  |
Tampa Electric Division [Member] | Line of Credit [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term Debt, Weighted Average Interest Rate | 1.49% |  | 0.00%
New Mexico Gas Company [Member] | Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD 168 |  | CAD 0
Line of Credit Facility, Expiration Date | Dec. 31, 2018 |  |
New Mexico Gas Company [Member] | Line of Credit [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term Debt, Weighted Average Interest Rate | 1.71% |  | 0.00%
Grand Bahama Power Company Limited [Member] | Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD 17 |  | CAD 18
Line of Credit Facility, Expiration Date | Dec. 31, 2017 |  |
Emera Energy Services [Member] | Line of Credit [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD 0 |  | CAD 0
Line of Credit Facility, Expiration Date | Dec. 31, 2014 |  |
Short-term Debt, Weighted Average Interest Rate | 0.00% |  | 0.00%

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- Definition Advances against the line of credit facility which can be made by way of overdraft. + References No definition available. + Details
Name: | ema_CreditFacilityAdvances
Namespace Prefix: | ema_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowed funds under the facility. + References No definition available. + Details
Name: | ema_UseOfAvailableFacilities
Namespace Prefix: | ema_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Weighted average interest rate of short-term debt outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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