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Cash flows (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Supplemental disclosures of cash flow information |  |
Interest paid | $ 21 he_InterestPaidToNonAffiliates | $ 20 he_InterestPaidToNonAffiliates
Income taxes paid | 1 us-gaap_IncomeTaxesPaid | 1 us-gaap_IncomeTaxesPaid
Income taxes refunded | 47 us-gaap_ProceedsFromIncomeTaxRefunds | 19 us-gaap_ProceedsFromIncomeTaxRefunds
Supplemental disclosures of noncash activities |  |
Increases in common stock related to director and officer compensatory plans | 2 he_StockIssuedDuringPeriodValueDirectorAndOfficerCompensatoryPlans | 1 he_StockIssuedDuringPeriodValueDirectorAndOfficerCompensatoryPlans
Real estate acquired in settlement of loans | 0 he_NoncashOrPartNoncashAcquisitionOfRealEstateInSettlementOfLoans | 1 he_NoncashOrPartNoncashAcquisitionOfRealEstateInSettlementOfLoans
Real estate transferred from property, plant and equipment to other assets held-for-sale | 5 us-gaap_TransferOfOtherRealEstate | 0 us-gaap_TransferOfOtherRealEstate
Obligations to fund low income housing investments | 0 us-gaap_AffordableHousingProgramAssessments | 10 us-gaap_AffordableHousingProgramAssessments
Additions to electric utility property, plant and equipment - unpaid invoices and other | 24 he_AdditionsToElectricUtilityPropertyPlantAndEquipmentUnpaidInvoicesAndOther | 9 he_AdditionsToElectricUtilityPropertyPlantAndEquipmentUnpaidInvoicesAndOther
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Supplemental disclosures of cash flow information |  |
Interest paid | 13 he_InterestPaidToNonAffiliates / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 13 he_InterestPaidToNonAffiliates / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Income taxes refunded | 6 us-gaap_ProceedsFromIncomeTaxRefunds / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 8 us-gaap_ProceedsFromIncomeTaxRefunds / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Supplemental disclosures of noncash activities |  |
Additions to electric utility property, plant and equipment - unpaid invoices and other | $ 24 he_AdditionsToElectricUtilityPropertyPlantAndEquipmentUnpaidInvoicesAndOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 9 he_AdditionsToElectricUtilityPropertyPlantAndEquipmentUnpaidInvoicesAndOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

X
- Definition Represents the amount of additions to electric utility property, plant and equipment, which included unpaid invoices and other. + References No definition available. + Details
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Period Type: | duration

X
- Definition The amount of cash paid for interest of non-affiliates during the period. + References No definition available. + Details
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X
- Definition The amount of real estate that the entity acquired in settlement of loans in noncash (or part noncash) transactions. Noncash is defined as an information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments during the period. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Value of stock issued during the period from director and officer compensatory plans in noncash transactions. + References No definition available. + Details
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X
- Definition Amount of expense for Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932. + References No definition available. + Details
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- Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Value transferred out of real estate owned (REO) in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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