XML 91 R41.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Electric utility subsidiary - Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Revenue taxes |  |  |  |
Electric Utility Revenue Taxes Included in Operating Revenues and in Taxes Other than Income Taxes Expense | $ 50 | $ 64 | $ 101 | $ 129

X
- Definition Represents the utility revenue taxes included in operating revenues and in taxes, other than income taxes expense. + References No definition available. + Details
Name: | he_ElectricUtilityRevenueTaxesIncludedInOperatingRevenuesAndInTaxesOtherThanIncomeTaxesExpense
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | he_RevenueTaxesLineItems
Namespace Prefix: | he_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=he_HawaiianElectricCompanyAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |