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Bank segment (HEI only) Mortgage Servicing Rights- Narrative (Details) (American Savings Bank (ASB), USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Loans receivable |  |  |
Repurchased mortgage loans | $ 0.5 he_MortgageLoansonRealEstateRepurchases | $ 1.9 he_MortgageLoansonRealEstateRepurchases | $ 0.4 he_MortgageLoansonRealEstateRepurchases
Mortgage servicing fees | 3.5 us-gaap_FeesAndCommissionsMortgageBankingAndServicing | 3.3 us-gaap_FeesAndCommissionsMortgageBankingAndServicing | 2.8 us-gaap_FeesAndCommissionsMortgageBankingAndServicing
Residential loan |  |  |
Loans receivable |  |  |
Proceeds from sale of mortgage loans | 155.0 us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 273.8 us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 513.0 us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Gain on sale of mortgage loans | $ 2.9 us-gaap_GainLossOnSaleOfMortgageLoans / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 8.3 us-gaap_GainLossOnSaleOfMortgageLoans / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 14.6 us-gaap_GainLossOnSaleOfMortgageLoans / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember

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- Definition Mortgage Loans on Real Estate, Repurchases + References No definition available. + Details
Name: | he_MortgageLoansonRealEstateRepurchases
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References No definition available. + Details
Name: | us-gaap_FeesAndCommissionsMortgageBankingAndServicing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3461-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |