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Electric utility segment Consolidating Statement of Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income for common stock	$ 33,157us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 47,815us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 41,421us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 45,927us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 39,013us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 48,236us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 40,588us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 33,679us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 168,320us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 161,516us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 138,658us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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									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
HECO
Net income for common stock									137,641us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	122,929us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	99,276us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net gains (losses) arising during the period, net of (taxes) benefits									(218,608)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	203,479us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(90,082)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
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 = us-gaap_SubsidiariesMember	20,694he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	13,673he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes									207,833he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(222,595)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	75,471he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other comprehensive income (loss), net of taxes									(563)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,578us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(938)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc.									137,078us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	124,507us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	98,338us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
HELCO
Net income for common stock									18,689us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesTwoMember	20,136us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesTwoMember	16,212us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesTwoMember
Net gains (losses) arising during the period, net of (taxes) benefits									(28,725)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember	30,542us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember	(13,577)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits									1,270he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember	2,880he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember	2,101he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes									27,437he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember	(33,277)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember	11,442he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember
Other comprehensive income (loss), net of taxes									(18)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesTwoMember	145us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesTwoMember	(34)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesTwoMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc.									18,671us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember	20,281us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember	16,178us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember
MECO
Net income for common stock									22,275us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesThreeMember	21,277us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesThreeMember	12,627us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Net gains (losses) arising during the period, net of (taxes) benefits									(29,352)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember	27,820us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember	(10,935)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits									1,090he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember	2,557he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember	1,771he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes									28,257he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember	(30,254)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember	9,093he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Other comprehensive income (loss), net of taxes									(5)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesThreeMember	123us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesThreeMember	(71)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc.									22,270us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember	21,400us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember	12,556us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Other subsidiaries
Net income for common stock									0us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember	(3)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember	(3)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Net gains (losses) arising during the period, net of (taxes) benefits											0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits											0he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes											0he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Other comprehensive income (loss), net of taxes											0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc.									0us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember	(3)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember	(3)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Consolidating adjustments
Net income for common stock									(40,964)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(41,410)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(28,836)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Net gains (losses) arising during the period, net of (taxes) benefits									58,077us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(58,362)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	24,512us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits									(2,360)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(5,437)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(3,872)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes									(55,694)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	63,531he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(20,535)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Other comprehensive income (loss), net of taxes									23us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(268)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	105us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc.									(40,941)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(41,678)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember	(28,731)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
HECO Consolidated
Net income for common stock	29,112us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	38,879us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	34,230us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	35,420us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	31,990us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	37,817us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	28,693us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	24,429us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	137,641us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	122,929us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	99,276us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
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									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

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Reclassification adjustments on pension and post retirement benefits for the accounting impact of the decisions issued by the Public Utilities Commission, net of income taxes.

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