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Income taxes Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 91,672us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 86,711us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 76,092us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from:
State income taxes, net of effect on federal income taxes	7,490us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	7,772us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	6,464us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net	(7,450)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(10,142)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(5,697)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Federal and state taxes	91,712us-gaap_IncomeTaxExpenseBenefit	84,341us-gaap_IncomeTaxExpenseBenefit	76,859us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate (as a percent)	35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	34.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	35.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Hawaiian Electric Company, Inc. and Subsidiaries
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	77,126us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	67,914us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	56,812us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Increase (decrease) resulting from:
State income taxes, net of effect on federal income taxes	7,047us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	6,211us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	5,453us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Other, net	(3,448)us-gaap_IncomeTaxReconciliationOtherReconcilingItems / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	(5,008)us-gaap_IncomeTaxReconciliationOtherReconcilingItems / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	(1,217)us-gaap_IncomeTaxReconciliationOtherReconcilingItems / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Federal and state taxes	$ 80,725us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	$ 69,117us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	$ 61,048us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Effective income tax rate (as a percent)	36.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	35.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	37.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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