XML 182 R165.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Non-controlling Interest In Subsidiaries (Non-controlling interest in subsidiaries ) (Details) - CAD shares in Millions, CAD in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 17, 2015 | Dec. 31, 2016 | Mar. 22, 2016 | Dec. 31, 2015
Noncontrolling Interest [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | CAD 112 |  | CAD 134
Icd Utilities Limited [Member] |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | CAD 53 |  | 52
Emera (Caribbean) Incorporated Parent [Member] |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | [1] |  |  |  | CAD 25
Indirect Wholly-owned Subsidiary, Shares Acquired |  | 2.6 | 0.7 |  |
Equity Method Investment, Ownership Percentage |  |  | 95.50% | 80.70% |
Controlling Interest Ownership Percentage By Parent |  |  | 100.00% | 95.50% | 95.50%
Grand Bahama Power Company Limited [Member] |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling Interest, Amount Represented by Preferred Stock |  |  | CAD 34 |  | CAD 34
Dominica Electricity Services Ltd. [Member] |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | CAD 25 |  | CAD 23
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 51.90% |  |
[1] | (1) On December 17, 2015, an indirect wholly owned subsidiary of Emera acquired approximately 2.6 million ECI shares, increasing its ownership interest from 80.7 per cent to 95.5 per cent. On March 22, 2016, an indirect wholly-owned subsidiary of Emera acquired 0.7 million ECI shares (which owns 51.9 per cent share of Domlec), increasing Emera's ownership interest in ECI from 95.5 to 100 per cent.

X
- Definition The parent entitys direct controlling (50 percent or more) ownership interest in net assets of the subsidiary for which the equity method has not been specified, expressed as a percentage. + References No definition available. + Details
Name: | ema_ControllingInterestOwnershipPercentageByParent
Namespace Prefix: | ema_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The indirect wholly-owned subsidiary shares acquired. + References No definition available. + Details
Name: | ema_IndirectWhollyOwnedSubsidiarySharesAcquired
Namespace Prefix: | ema_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: 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(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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(a)(24)) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_MinorityInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of noncontrolling interest in subsidiary represented by preferred securities issued by the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(24)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: 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(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_MinorityInterestAmountRepresentedByPreferredStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_MinorityInterestLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=ema_IcdUtilitiesLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ema_EmeraCaribbeanIncorporatedParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ema_GrandBahamaPowerCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ema_DominicaElectricityServicesLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |