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Bank segment - Repurchase Agreements (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Offsetting Liabilities [Line Items] |  |
Gross amount of recognized liabilities | $ 212 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross | $ 191 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Securities sold under agreements to repurchase | 212 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 191 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Securities sold under agreements to repurchase collateral, financial instruments | 212 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments | 191 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments
Financial Institution |  |
Offsetting Liabilities [Line Items] |  |
Securities sold under agreements to repurchase | 50 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_FinancialInstitutionMember | 50 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_FinancialInstitutionMember
Securities sold under agreements to repurchase collateral, financial instruments | 50 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_FinancialInstitutionMember | 50 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_FinancialInstitutionMember
Government Entities |  |
Offsetting Liabilities [Line Items] |  |
Securities sold under agreements to repurchase | 56 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_GovernmentEntitiesMember | 56 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_GovernmentEntitiesMember
Securities sold under agreements to repurchase collateral, financial instruments | 56 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_GovernmentEntitiesMember | 56 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_GovernmentEntitiesMember
Commercial account holders |  |
Offsetting Liabilities [Line Items] |  |
Securities sold under agreements to repurchase | 106 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_CommercialAccountHoldersMember | 85 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_CommercialAccountHoldersMember
Securities sold under agreements to repurchase collateral, financial instruments | $ 106 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_CommercialAccountHoldersMember | $ 85 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_CommercialAccountHoldersMember

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- Definition Amount of right to receive financial instruments collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase. + References No definition available. + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=45278096&loc=d3e9760-107771 Reference 6: 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.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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