XML 60 R47.htm IDEA: XBRL DOCUMENT
v3.23.1

Electric utility segment - Army privatization (Details) - Hawaiian Electric Company, Inc. and Subsidiaries $ in Millions | Mar. 01, 2022 USD ($) | Oct. 30, 2020 USD ($) installation
--- | --- | ---
Regulatory Projects and Legal Obligations [Line Items] |  |
Public utilities, electric distribution system, contract period | 50 years | 50 years
Number of U.S. army installations being serviced | installation |  | 12
Purchase price | $ 14.5 |
price of acquisition, expected |  | $ 4.0
Transition period | 1 year |
Capital upgrade over the period | 6 years |

X
- Definition Number Of U.S. Army Installations Being Serviced + References No definition available. + Details
Name: | he_NumberOfUSArmyInstallationsBeingServiced
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Electric Distribution System, Acquisition Purchase Price + References No definition available. + Details
Name: | he_PublicUtilitiesElectricDistributionSystemAcquisitionPurchasePrice
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Electric Distribution System, Capital Upgrade Period + References No definition available. + Details
Name: | he_PublicUtilitiesElectricDistributionSystemCapitalUpgradePeriod
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Electric Distribution System, Contract Period + References No definition available. + Details
Name: | he_PublicUtilitiesElectricDistributionSystemContractPeriod
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Electric Distribution System, Price Of Acquiring Additional Assets, Expected + References No definition available. + Details
Name: | he_PublicUtilitiesElectricDistributionSystemPriceOfAcquiringAdditionalAssetsExpected
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Electric Distribution System, Transition Period + References No definition available. + Details
Name: | he_PublicUtilitiesElectricDistributionSystemTransitionPeriod
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | he_RegulatoryProjectsAndLegalObligationsLineItems
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: |