Public Utilities In Regulatory Assets

No definition available.

Name:	he_PublicUtilitiesInRegulatoryAssets
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Public Utility, ERP/EAM Project Service Period

+ References

No definition available.

+ Details

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

- Definition

Public Utility, ERP/EAM Regulatory Liability For Operation And Maintenance Expense Reductions

+ References

No definition available.

+ Details

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

- Definition

Public Utility, ERP/EAM Required Pass-through Savings Over 12 Years

+ References

No definition available.

+ Details

Name:	he_PublicUtilityERPEAMRequiredPassthroughSavingsOver12Years
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Public Utility, ERP/EAM System, Future Cost Avoidance Related To Capital Cost And Tax Cost

+ References

No definition available.

+ Details

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

- Definition

Public Utility, ERP/EAM System, Future Operation And Maintenance Expense Reductions

+ References

No definition available.

+ Details

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

- 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

- 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

- Definition

Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478742/980-340-50-1

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortization period for the recovery of regulatory liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_RegulatoryLiabilityAmortizationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=he_ERPEAMImplementationProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_RegulatoryAssetAxis=he_HonoluluGeneratingUnits8And9Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=he_WaiauGeneratingUnits3And4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=he_SuspensionOfDisconnectionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Electric utility segment - Regulatory Assets and Liability Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 29, 2023	Dec. 31, 2024	Dec. 31, 2023	Jun. 10, 2019	Oct. 31, 2018
Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory Projects and Legal Obligations [Line Items]
Regulatory assets		$ 281,319	$ 294,804
Recovery of deferral costs period (in years)	3 years
Hawaiian Electric Company, Inc. and Subsidiaries \| ERP/EAM Implementation Project
Regulatory Projects and Legal Obligations [Line Items]
ERP/EAM project service period (in years)		12 years
ERP/EAM required pass-through savings					$ 246,000
ERP/EAM implementation project, expected future O&M expense reductions				$ 150,000
ERP/EAM implementation project, future cost avoidance related to capital costs and tax costs				$ 96,000
Regulatory liability, amortization period		5 years
ERP/EAM regulatory liability for operation and maintenance expense reductions		$ 12,500
Hawaiian Electric Company, Inc. and Subsidiaries \| Natural Disasters and Other Casualty Events
Regulatory Projects and Legal Obligations [Line Items]
Regulatory assets		52,700
Hawaiian Electric Company, Inc. and Subsidiaries \| COVID-19
Regulatory Projects and Legal Obligations [Line Items]
Regulatory assets		6,700
Public utilities in regulatory assets	$ 8,800
Hawaiian Electric \| ERP/EAM Implementation Project
Regulatory Projects and Legal Obligations [Line Items]
ERP/EAM regulatory liability for operation and maintenance expense reductions		1,200
Hawaii Electric Light \| ERP/EAM Implementation Project
Regulatory Projects and Legal Obligations [Line Items]
ERP/EAM regulatory liability for operation and maintenance expense reductions		4,500
Maui Electric \| ERP/EAM Implementation Project
Regulatory Projects and Legal Obligations [Line Items]
ERP/EAM regulatory liability for operation and maintenance expense reductions		$ 6,800
Honolulu Generating Units 8 and 9 \| Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory Projects and Legal Obligations [Line Items]
Regulatory asset amortization period		9 years
Regulatory assets		$ 26,700
Waiau Generating Units 3 and 4 \| Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory Projects and Legal Obligations [Line Items]
Regulatory asset amortization period		9 years
Regulatory assets		$ 14,300
Suspension Of Disconnections \| Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory Projects and Legal Obligations [Line Items]
Regulatory assets		$ 2,800