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Consolidated Balance Sheets (unaudited) (Parenthetical) - HECO (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Common stock, authorized shares	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, outstanding shares	107,417,644us-gaap_CommonStockSharesOutstanding	102,565,266us-gaap_CommonStockSharesOutstanding
Hawaiian Electric Company, Inc. and Subsidiaries
Nonutility property, plant and equipment, accumulated depreciation	1,228he_NonutilitiesPropertyPlantandEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	1,227he_NonutilitiesPropertyPlantandEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Common stock, par value (in dollars per share)	6.67us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	6.67us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Common stock, authorized shares	50,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	50,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Common stock, outstanding shares	15,805,327us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	15,805,327us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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