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Electric utility segment - Unconsolidated Variable Interest Entities (Details)	3 Months Ended
	Mar. 31, 2025 entity agreement
Power purchase agreement
Number of IPPs (in entities) | entity	2
Hawaiian Electric Company
Power purchase agreement
Number of power purchase agreements (PPAs) (in agreements) | agreement	4

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

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

+ References

No definition available.

+ Details

Name:	he_PowerPurchaseAgreementAbstract
Namespace Prefix:	he_
Data Type:	xbrli:stringItemType
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

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: