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Bank segment (HEI only) Statements of Comprehensive Income- Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net unrealized gains (losses) on securities arising during the period, taxes | $ 3,856 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | $ (9,037)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | $ 631 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Less: reclassification adjustment for net realized gains included in net income, taxes | (1,132)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | (488)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | (53)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Net gains (losses) arising during the period, tax benefits | (149,364)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax | 142,478 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax | (63,303)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits | 7,245 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax | 14,870 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax | 9,764 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax
American Savings Bank (ASB) |  |  |
Net unrealized gains (losses) on securities arising during the period, taxes | 3,856 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (9,037)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 631 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Less: reclassification adjustment for net realized gains included in net income, taxes | 1,132 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 488 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 53 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Net gains (losses) arising during the period, tax benefits | (6,164)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 10,450 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (5,240)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits | $ (561)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ (1,187)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ (684)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember

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- Definition Tax effect on adjustment out of other comprehensive income for actuarial gains or losses, prior service gains or losses, and net transition asset or obligation recognized as a component of net periodic benefit cost during the period. + References No definition available. + Details
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- Definition Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e,f) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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