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Bank segment (HEI only) Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Hawaiian Electric Industries, Inc. | Consolidated subsidiary | American Savings Bank (ASB) | Management and administrative services |  |  |
Revenue from related party | $ 2,300,000 us-gaap_RevenueFromRelatedParties / us-gaap_CounterpartyNameAxis = he_AmericanSavingsBankFSBMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RelatedPartyTransactionAxis = he_ManagementandAdministrativeServicesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = he_ConsolidatedSubsidiaryMember | $ 2,300,000 us-gaap_RevenueFromRelatedParties / us-gaap_CounterpartyNameAxis = he_AmericanSavingsBankFSBMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RelatedPartyTransactionAxis = he_ManagementandAdministrativeServicesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = he_ConsolidatedSubsidiaryMember | $ 1,900,000 us-gaap_RevenueFromRelatedParties / us-gaap_CounterpartyNameAxis = he_AmericanSavingsBankFSBMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RelatedPartyTransactionAxis = he_ManagementandAdministrativeServicesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = he_ConsolidatedSubsidiaryMember
Hawaiian Electric Industries, Inc. | Maximum |  |  |
Obligation to contribute additional capital under the Capital Maintenance Agreement | 65,100,000 he_ObligationToContributeAdditionalCapitalUnderCapitalMaintenanceAgreement / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Reduction in obligation to contribute additional capital under the Capital Maintenance Agreement | 28,300,000 he_RemainingObligationToContributeAdditionalCapitalUnderCapitalMaintenanceAgreement / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
American Savings Bank (ASB) |  |  |
Borrowing capacity | 1,200,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,100,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |
Cash dividends paid | $ 36,000,000 us-gaap_CashDividendsPaidToParentCompany / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 40,000,000 us-gaap_CashDividendsPaidToParentCompany / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |

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- Definition This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 06 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph b -Article 12 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
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