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Electric utility subsidiary - Taxes (Details) (Hawaiian Electric Company, Inc. and Subsidiaries, USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Revenue taxes |  |
Electric Utility Revenue Taxes Included in Operating Revenues and in Taxes Other than Income Taxes Expense | $ 51 he_ElectricUtilityRevenueTaxesIncludedInOperatingRevenuesAndInTaxesOtherThanIncomeTaxesExpense / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 65 he_ElectricUtilityRevenueTaxesIncludedInOperatingRevenuesAndInTaxesOtherThanIncomeTaxesExpense / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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- Definition Represents the utility revenue taxes included in operating revenues and in taxes, other than income taxes expense. + References No definition available. + Details
Name: | he_ElectricUtilityRevenueTaxesIncludedInOperatingRevenuesAndInTaxesOtherThanIncomeTaxesExpense
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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