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Income taxes Components of Income Taxes Attributable to Net Income for Common Stock (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal
Current	$ 33,762us-gaap_CurrentFederalTaxExpenseBenefit	$ (1,520)us-gaap_CurrentFederalTaxExpenseBenefit	$ (15,411)us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	46,427us-gaap_DeferredFederalIncomeTaxExpenseBenefit	73,680us-gaap_DeferredFederalIncomeTaxExpenseBenefit	82,138us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred tax credits, net	0he_DeferredFederalTaxCreditsNet	224he_DeferredFederalTaxCreditsNet	187he_DeferredFederalTaxCreditsNet
Federal taxes	80,189us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	72,384us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	66,914us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State
Current	(7,339)us-gaap_CurrentStateAndLocalTaxExpenseBenefit	(1,555)us-gaap_CurrentStateAndLocalTaxExpenseBenefit	(4,654)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred	12,756us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	6,719us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	8,710us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred tax credits, net	6,106he_DeferredStateAndLocalTaxCreditsNet	6,793he_DeferredStateAndLocalTaxCreditsNet	5,889he_DeferredStateAndLocalTaxCreditsNet
State taxes	11,523us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	11,957us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	9,945us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Federal and state taxes	91,712us-gaap_IncomeTaxExpenseBenefit	84,341us-gaap_IncomeTaxExpenseBenefit	76,859us-gaap_IncomeTaxExpenseBenefit
Hawaiian Electric Company, Inc. and Subsidiaries
Federal
Current	1,108us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	1,313us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	(26,965)us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Deferred	68,775us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	58,024us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	79,437us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Deferred tax credits, net	0he_DeferredFederalTaxCreditsNet / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	224he_DeferredFederalTaxCreditsNet / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	186he_DeferredFederalTaxCreditsNet / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Federal taxes	69,883us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	59,561us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	52,658us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
State
Current	(9,436)us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	(3,720)us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	(4,940)us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Deferred	14,172us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	6,483us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	7,441us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Deferred tax credits, net	6,106he_DeferredStateAndLocalTaxCreditsNet / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	6,793he_DeferredStateAndLocalTaxCreditsNet / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	5,889he_DeferredStateAndLocalTaxCreditsNet / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
State taxes	10,842us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	9,556us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	8,390us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations / 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

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