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Income taxes Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Expense (Benefit) [Line Items] |  |  |
Amount at the federal statutory income tax rate | $ 91,672 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 86,711 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 76,092 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from: |  |  |
State income taxes, net of effect on federal income taxes | 7,490 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 7,772 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 6,464 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net | (7,450)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (10,142)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (5,697)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Federal and state taxes | 91,712 us-gaap_IncomeTaxExpenseBenefit | 84,341 us-gaap_IncomeTaxExpenseBenefit | 76,859 us-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 | 77,126 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 67,914 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 56,812 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Increase (decrease) resulting from: |  |  |
State income taxes, net of effect on federal income taxes | 7,047 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 6,211 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 5,453 us-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 | $ 80,725 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 69,117 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 61,048 us-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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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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