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Bank segment - Contingencies (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015
March 2011 Class Action Lawsuit |  |
Loss Contingencies [Line Items] |  |
Litigation Settlement, Amount | $ (2.0)us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = he_March2011ClassActionLawsuitMember |
Loss Contingency Accrual |  | 2.0 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LitigationCaseAxis = he_March2011ClassActionLawsuitMember
American Savings Bank (ASB) |  |
Loss Contingencies [Line Items] |  |
Unfunded commitments to fund the company's LIHTC | $ 14.8 he_QualifiedAffordableHousingProjectInvestmentsCommitment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 12.5 he_QualifiedAffordableHousingProjectInvestmentsCommitment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember

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- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References No definition available. + Details
Name: | he_QualifiedAffordableHousingProjectInvestmentsCommitment
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | us-gaap_LitigationCaseAxis=he_March2011ClassActionLawsuitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |