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Electric utility segment - Unconsolidated variable interest entities (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 entity MW	Mar. 31, 2021 MW	Jun. 30, 2021 agreement entity
Power purchase agreement
Number of IPPs (in entities) | entity	3		3
Puna Geothermal Venture Power Purchase Agreement
Power purchase agreement
Firm capacity volume (in megawatts) | MW	23.9	13
Hawaiian Electric Company
Power purchase agreement
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

-- 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

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

- 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: