XML 129 R76.htm IDEA: XBRL DOCUMENT
v3.20.1

Dispositions (Narrative) (Details) $ in Millions | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 05, 2019 CAD ($) | Mar. 29, 2019 CAD ($) Facilities | Mar. 29, 2019 USD ($) Facilities | Mar. 25, 2019 CAD ($) | Mar. 25, 2019 USD ($) | Dec. 20, 2019 CAD ($)
Emera Maine | Held for sale |  |  |  |  |  |
Details of the assets and liabilities classified as held for sale [Line items] |  |  |  |  |  |
Disposition, Depreciation and Amortization |  |  |  | $ 39,000,000 | $ 29 |
Emera Maine | Held for sale | Plan, subject to approval |  |  |  |  |  |
Details of the assets and liabilities classified as held for sale [Line items] |  |  |  |  |  |
Disposition, Name |  |  |  | Emera Maine | Emera Maine |
Description and Timing and Disposition |  |  |  | The transaction is expected to close in early 2020 | The transaction is expected to close in early 2020 |
Disposition, Value |  |  |  |  | $ 1,300 |
Proceeds on disposition of business |  |  |  |  | $ 959 |
EUS | Disposition |  |  |  |  |  |
Details of the assets and liabilities classified as held for sale [Line items] |  |  |  |  |  |
Disposition, Name |  |  |  |  |  | EUS
Description and Timing and Disposition |  |  |  |  |  | EUS ceased operations on September 30, 2019
Disposition, Value |  |  |  |  |  | $ 0
New England Gas Generating Facilities [Member] | Disposition |  |  |  |  |  |
Details of the assets and liabilities classified as held for sale [Line items] |  |  |  |  |  |
Disposition, Name |  | New England Gas Generation | New England Gas Generation |  |  |
Description and Timing and Disposition |  | The NEGG assets were classified as held for sale at December 31, 2018 and the Company ceased depreciation of these assets on November 27, 2018. | The NEGG assets were classified as held for sale at December 31, 2018 and the Company ceased depreciation of these assets on November 27, 2018. |  |  |
Proceeds on disposition of business |  | $ 799,000,000 | $ 598 |  |  |
Number of facilities | Facilities |  | 3 | 3 |  |  |
Segment that Includes Disposition |  | Other reportable segment | Other reportable segment |  |  |
Bayside Power Limited Partnership [Member] | Disposition |  |  |  |  |  |
Details of the assets and liabilities classified as held for sale [Line items] |  |  |  |  |  |
Disposition, Name | Bayside facility |  |  |  |  |
Proceeds on disposition of business | $ 46,000,000 |  |  |  |  |
Segment that Includes Disposition | Other reportable segment |  |  |  |  |

X
- Definition The number of facilities, expressed as an integer. + References No definition available. + Details
Name: | ema_NumberOfFacilities
Namespace Prefix: | ema_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Description of the facts and circumstances leading to the completed or expected disposal, and the manner and timing of that disposal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.Z.5.Q2) -URI http://asc.fasb.org/extlink&oid=26872618&loc=d3e7384-122677 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationDescriptionAndTimingOfDisposal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Identification of the segment that the disposal group, including discontinued operation is reported. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationSegmentThatIncludesDisposalGroup
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Name of disposal group not classified as discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
Name: | us-gaap_DisposalGroupNotDiscontinuedOperationName
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ema_EmeraMaineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ema_EmeraUtilityServicesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ema_NewEnglandGasGeneratingFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ema_BaysidePowerLimitedPartnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |