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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
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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 | $ 33,157 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 47,815 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 41,421 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 45,927 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 39,013 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 48,236 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 40,588 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 33,679 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 168,320 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 161,516 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 138,658 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net gains (losses) arising during the period, net of (taxes) benefits |  |  |  |  |  |  |  |  | (234,166)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | 223,177 us-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 |  |  |  |  |  |  |  |  | 11,344 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax | 23,280 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax | 15,291 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | 207,833 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax | (222,595)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax | 75,471 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (10,628)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 9,673 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (7,286)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income attributable to Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  | 157,692 us-gaap_ComprehensiveIncomeNetOfTax | 171,189 us-gaap_ComprehensiveIncomeNetOfTax | 131,372 us-gaap_ComprehensiveIncomeNetOfTax
HECO |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 137,641 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 122,929 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 99,276 us-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 | 203,479 us-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 |  |  |  |  |  |  |  |  | 10,212 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 20,694 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 13,673 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | 207,833 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (222,595)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 75,471 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (563)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,578 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (938)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  | 137,078 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 124,507 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 98,338 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
HELCO |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 18,689 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 20,136 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 16,212 us-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 | 30,542 us-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 |  |  |  |  |  |  |  |  | 1,270 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 2,880 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 2,101 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | 27,437 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember | (33,277)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 11,442 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (18)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 145 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesTwoMember | (34)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesTwoMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  | 18,671 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 20,281 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 16,178 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember
MECO |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 22,275 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 21,277 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 12,627 us-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 | 27,820 us-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 |  |  |  |  |  |  |  |  | 1,090 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 2,557 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 1,771 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | 28,257 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember | (30,254)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 9,093 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 123 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesThreeMember | (71)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  | 22,270 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 21,400 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 12,556 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Other subsidiaries |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 0 us-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 |  |  |  |  |  |  |  |  |  |  | 0 us-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 |  |  |  |  |  |  |  |  |  |  | 0 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  |  |  | 0 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  | 0 us-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 |  |  |  |  |  |  |  |  | 58,077 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (58,362)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 24,512 us-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 | 63,531 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (20,535)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 23 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (268)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 105 us-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 | 29,112 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 38,879 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 34,230 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 35,420 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 31,990 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 37,817 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 28,693 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 24,429 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 137,641 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 122,929 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 99,276 us-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 | 203,479 us-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 |  |  |  |  |  |  |  |  | 10,212 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 20,694 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 13,673 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | 207,833 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | (222,595)he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 75,471 he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (563)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1,578 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | (938)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  | $ 137,078 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 124,507 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 98,338 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

X
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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