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Bank segment (HEI only) Securities Sold Under Agreements to Repurchase, Including Related Collateral Received From or Pledged to Counterparties (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Securities sold under agreements to repurchase |  |  |
Gross amount of recognized liabilities, repurchase agreements | $ 191,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross | $ 145,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross |
Net amount of liabilities presented in the Balance Sheet, repurchase agreements | 191,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 145,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase |
Financial instruments | 191,000,000 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments | 145,000,000 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments |
Identical securities |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 190,656,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 145,000,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 146,000,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember
Average amount outstanding during the year | 155,000,000 he_AssetsSoldUnderAgreementsToRepurchaseAverageRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 147,000,000 he_AssetsSoldUnderAgreementsToRepurchaseAverageRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 173,000,000 he_AssetsSoldUnderAgreementsToRepurchaseAverageRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember
Maximum amount outstanding as of any month-end | 195,000,000 he_AssetsSoldUnderAgreementsToRepurchaseMaximumRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 151,000,000 he_AssetsSoldUnderAgreementsToRepurchaseMaximumRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 189,000,000 he_AssetsSoldUnderAgreementsToRepurchaseMaximumRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember
Weighted-average interest rate as of end of the period (as a percent) | 1.45%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 1.75%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 1.74%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember
Weighted-average interest rate during the year (as a percent) | 1.67%he_AssetsSoldUnderAgreementsToRepurchaseInterestRateDuringPeriod / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 1.74%he_AssetsSoldUnderAgreementsToRepurchaseInterestRateDuringPeriod / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 1.56%he_AssetsSoldUnderAgreementsToRepurchaseInterestRateDuringPeriod / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember
Weighted-average remaining days to maturity as of end of the period | 343 days | 367 days | 489 days
Overnight |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 84,758,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember |  |
Weighted-average interest rate as of end of the period (as a percent) | 0.15%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember |  |
1 to 29 days |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 0 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember |  |
Weighted-average interest rate as of end of the period (as a percent) | 0.00%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember |  |
30 to 90 days |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 0 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember |  |
Weighted-average interest rate as of end of the period (as a percent) | 0.00%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember |  |
Over 90 days |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 105,898,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember |  |
Weighted-average interest rate as of end of the period (as a percent) | 2.50%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember |  |
Financial institution |  |  |
Securities sold under agreements to repurchase |  |  |
Net amount of liabilities presented in the Balance Sheet, repurchase agreements | 50,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_FinancialInstitutionMember | 51,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_FinancialInstitutionMember |
Financial instruments | 50,000,000 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_FinancialInstitutionMember | 51,000,000 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_FinancialInstitutionMember |
Government entities |  |  |
Securities sold under agreements to repurchase |  |  |
Net amount of liabilities presented in the Balance Sheet, repurchase agreements | 56,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_GovernmentEntitiesMember |  |
Financial instruments | 56,000,000 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_GovernmentEntitiesMember |  |
Commercial account holders |  |  |
Securities sold under agreements to repurchase |  |  |
Net amount of liabilities presented in the Balance Sheet, repurchase agreements | 85,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_CommercialAccountHoldersMember | 94,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CounterpartyNameAxis = he_CommercialAccountHoldersMember |
Financial instruments | $ 85,000,000 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_CommercialAccountHoldersMember | $ 94,000,000 he_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimFinancialInstruments / us-gaap_CounterpartyNameAxis = he_CommercialAccountHoldersMember |

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- Definition Average amount to be repaid to the counterparty to the repurchase agreement at a future date. + References No definition available. + Details
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- Definition Represents the interest rate on assets sold under agreements to repurchase. + References No definition available. + Details
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- Definition Maximum amount to be repaid to the counterparty to the repurchase agreement at a future date. + References No definition available. + Details
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- Definition Weighted-average remaining period of maturity for a group of securities or other assets sold under repurchase agreements, as of end of the period. + References No definition available. + Details
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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 Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: 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)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: 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)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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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