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Electric utility segment - Regulatory assets for COVID-19 related costs (Details) - Hawaiian Electric Company, Inc. and Subsidiaries - USD ($) $ in Millions		1 Months Ended
	Jun. 09, 2022	Dec. 31, 2021
Regulatory Projects and Legal Obligations [Line Items]
Recovery of deferral costs	$ 27.8
Recovery of deferral costs period	3 years
COVID-19
Regulatory Projects and Legal Obligations [Line Items]
Customer bill forgiveness		$ 2.0

X

- Definition

Customer Bill Forgiveness

+ References

No definition available.

+ Details

Name:	he_CustomerBillForgiveness
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Recovery Of Deferral Costs, CARES Act

+ References

No definition available.

+ Details

Name:	he_RecoveryOfDeferralCostsCARESAct
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Recovery Of Deferral Costs, CARES Act, Period

+ References

No definition available.

+ Details

Name:	he_RecoveryOfDeferralCostsCARESActPeriod
Namespace Prefix:	he_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

-- None. No documentation exists for this element. --

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No definition available.

+ Details

Name:	he_RegulatoryProjectsAndLegalObligationsLineItems
Namespace Prefix:	he_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	dei_LegalEntityAxis=he_HawaiianElectricCompanyAndSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=he_COVID19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: