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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income for common stock $ 168,320us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 161,516us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 138,658us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net unrealized gains (losses) on available-for sale investment securities:      
Net unrealized gains (losses) on available-for sale investment securities arising during the period, net of (taxes) benefits of $(3,856), $9,037 and ($631) for 2014, 2013 and 2012, respectively 5,840us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (13,686)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 956us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: reclassification adjustment for net realized gains included in net income, net of taxes of $1,132, $488 and $53 for 2014, 2013 and 2012, respectively (1,715)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (738)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (81)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Derivatives qualified as cash flow hedges:      
Less: reclassification adjustment to net income, net of tax benefits of $150, $150 and $150 for 2014, 2013 and 2012, respectively 236us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 235us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 236us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Retirement benefit plans:      
Net gains (losses) arising during the period, net of (taxes) benefits (234,166)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 223,177us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (99,159)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 11,344he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax 23,280he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax 15,291he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits 207,833he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax (222,595)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax 75,471he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax
Other comprehensive income (loss), net of taxes (10,628)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 9,673us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (7,286)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 157,692us-gaap_ComprehensiveIncomeNetOfTax 171,189us-gaap_ComprehensiveIncomeNetOfTax 131,372us-gaap_ComprehensiveIncomeNetOfTax
Hawaiian Electric Company, Inc. and Subsidiaries      
Net income for common stock 137,641us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 122,929us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 99,276us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Retirement benefit plans:      
Net gains (losses) arising during the period, net of (taxes) benefits (218,608)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 203,479us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 (90,082)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 10,212he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 20,694he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 13,673he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits 207,833he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 (222,595)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 75,471he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Other comprehensive income (loss), net of taxes (563)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 1,578us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 (938)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 137,078us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 $ 124,507us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		 $ 98,338us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember