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Consolidated Statements of Comprehensive Income (Parenthetical) - HECO (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits | $ 2,443 | $ 1,405 | $ 7,321 | $ 3,513
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes | 2,129 | 1,074 | 6,386 | 3,875
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits | 2,178 | 1,150 | 6,532 | 3,999
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes | $ 2,129 | $ 1,074 | $ 6,386 | $ 3,875

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- Definition The amount of income taxes on the reclassification adjustments on pension and post retirement benefits for the accounting impact of the decisions issued by the Public Utilities Commission. + References No definition available. + Details
Name: | he_OtherComprehensiveIncomeReclassificationAdjustmentForImpactOfDecisionAndOrdersOfThePUCIncludedInRegulatoryAssetsTax
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration