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Regulatory restrictions on net assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Hawaiian Electric Company, Inc. and Subsidiaries |
Regulatory restrictions on net assets |
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances | $ 668 us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
American Savings Bank (ASB) |
Regulatory restrictions on net assets |
Amount of net assets available for transfer | $ 103 he_AmountOfNetAssetsAvailableForTransfer / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember

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- Definition Represents the amount of net assets that are available for transfer in the form of dividends to the parent company while maintaining a "well-capitalized" position. + References No definition available. + Details
Name: | he_AmountOfNetAssetsAvailableForTransfer
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | he_ScheduleOfRestrictedRegulatoryAssetsLineItems
Namespace Prefix: | he_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Subparagraph 3 -Article 4 + Details
Name: | us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=he_HawaiianElectricCompanyAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |