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v2.4.1.9

Cash flows (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplemental disclosures of cash flow information |  |  |
Interest paid to non-affiliates | $ 84,000,000 he_InterestPaidToNonAffiliates | $ 85,000,000 he_InterestPaidToNonAffiliates | $ 84,000,000 he_InterestPaidToNonAffiliates
Income taxes paid | 47,000,000 us-gaap_IncomeTaxesPaid | 18,000,000 us-gaap_IncomeTaxesPaid | 17,000,000 us-gaap_IncomeTaxesPaid
Income taxes refunded | 24,000,000 us-gaap_ProceedsFromIncomeTaxRefunds | 4,000,000 us-gaap_ProceedsFromIncomeTaxRefunds | 31,000,000 us-gaap_ProceedsFromIncomeTaxRefunds
Supplemental disclosures of noncash activities |  |  |
Common stock dividends reinvested in HEI common stock | 0 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan | 24,000,000 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan | 24,000,000 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan
Increases in common stock related to director and officer compensatory plans | 6,000,000 he_StockIssuedDuringPeriodValueDirectorAndOfficerCompensatoryPlans | 5,000,000 he_StockIssuedDuringPeriodValueDirectorAndOfficerCompensatoryPlans | 6,000,000 he_StockIssuedDuringPeriodValueDirectorAndOfficerCompensatoryPlans
Loans transferred from held for investment to held for sale | 0 us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 | 25,000,000 us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 | 0 us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
Real estate acquired in settlement of loans | 3,000,000 he_NoncashOrPartNoncashAcquisitionOfRealEstateInSettlementOfLoans | 4,000,000 he_NoncashOrPartNoncashAcquisitionOfRealEstateInSettlementOfLoans | 11,000,000 he_NoncashOrPartNoncashAcquisitionOfRealEstateInSettlementOfLoans
Obligations to fund low income housing investments, net | 14,000,000 us-gaap_AffordableHousingProgramAssessments | 1,000,000 us-gaap_AffordableHousingProgramAssessments | 0 us-gaap_AffordableHousingProgramAssessments
Electric utility property, plant and equipment |  |  |
AFUDC-equity | 6,771,000 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity | 5,561,000 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity | 7,007,000 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Unpaid invoices and other | 68,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentUnpaidInvoicesAndOther | 24,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentUnpaidInvoicesAndOther | 37,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentUnpaidInvoicesAndOther
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Supplemental disclosures of cash flow information |  |  |
Interest paid to non-affiliates | 61,000,000 he_InterestPaidToNonAffiliates / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 59,000,000 he_InterestPaidToNonAffiliates / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 57,000,000 he_InterestPaidToNonAffiliates / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Income taxes paid | 6,000,000 us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 6,000,000 us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 6,000,000 us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Income taxes refunded | 8,000,000 us-gaap_ProceedsFromIncomeTaxRefunds / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 32,000,000 us-gaap_ProceedsFromIncomeTaxRefunds / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 9,000,000 us-gaap_ProceedsFromIncomeTaxRefunds / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Electric utility property, plant and equipment |  |  |
AFUDC-equity | 6,771,000 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 5,561,000 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 7,007,000 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Estimated fair value of noncash contributions in aid of construction | 3,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentContributionsInAidOfConstruction / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 5,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentContributionsInAidOfConstruction / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 10,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentContributionsInAidOfConstruction / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Unpaid invoices and other | $ 65,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentUnpaidInvoicesAndOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 24,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentUnpaidInvoicesAndOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 37,000,000 he_NoncashOrPartNoncashIncreasesPropertyPlantAndEquipmentUnpaidInvoicesAndOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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