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Electric utility segment - Unconsolidated Variable Interest Entities (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 MW | Mar. 31, 2021 MW | Dec. 31, 2021 entity agreement
Variable Interest Entity [Line Items] |  |  |
Number of consolidation VIEs | entity |  |  | 3
Puna Geothermal Venture Power Purchase Agreement |  |  |
Variable Interest Entity [Line Items] |  |  |
Firm capacity volume | MW | 23.9 | 13.0 |
Subsidiaries |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  | 5

X
- Definition Represents the number of firm power purchase agreements entered into, by the company. + References No definition available. + Details
Name: | he_NumberOfPowerPurchaseAgreements
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Power Purchase Agreement, Firm Capacity Volume + References No definition available. + Details
Name: | he_PowerPurchaseAgreementFirmCapacityVolume
Namespace Prefix: | he_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Variable Interest Entity Number Of Consolidated VIEs + References No definition available. + Details
Name: | he_VariableInterestEntityNumberOfConsolidatedVIEs
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=he_PunaGeothermalVenturePowerPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |