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Bank segment - Contingencies (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015
March 2011 Class Action Lawsuit |  |
Loss Contingencies [Line Items] |  |
Litigation Settlement, Amount | $ (2.0) |
Loss Contingency Accrual |  | $ 2.0
American Savings Bank (ASB) |  |
Loss Contingencies [Line Items] |  |
Unfunded commitments to fund the company's LIHTC | $ 14.8 | $ 12.5

X
- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References No definition available. + Details
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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
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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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- 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
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- Details
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Namespace Prefix: |
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Period Type: |

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