XML 57 R42.htm IDEA: XBRL DOCUMENT
v3.25.2

Maui windstorm and wildfires - Narrative (Details) $ in Thousands |  |  |  | 1 Months Ended | 2 Months Ended | 6 Months Ended | 14 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2025 claim plaintiff | Nov. 01, 2024 USD ($) installment fund claim lawyer | May 04, 2024 USD ($) | Feb. 08, 2024 claim | Jun. 08, 2024 claim | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Nov. 06, 2024 claim | Dec. 31, 2024 USD ($) | Nov. 08, 2023 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 241,960 |  |  | $ 227,424 |
Property insurance policy limit |  |  |  |  |  | 500,000 |  |  |  |
Retention for property damages |  |  |  |  |  | 1,000 |  |  |  |
Property insurance coverage |  |  |  |  |  | 490,400 |  |  |  |
Settlement accrual, current liability |  |  |  |  |  | 478,750 |  |  | 478,750 |
Settlement accrual, non-current liabilities |  |  |  |  |  | 1,436,250 |  |  | 1,436,250 |
Excess liability insurance |  |  |  |  |  | 11,000 |  |  |  |
Miscellaneous professional liability |  |  |  |  |  | 0 |  |  |  |
Directors and officers liability insurance |  |  |  |  |  | 120,000 |  |  |  |
Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  |  |  | 52,000 |  |  |  |
Indemnification Agreement |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Amount agreed to contribute |  |  | $ 18,400 |  |  |  |  |  |  |
Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of settlement agreements | claim |  | 2 |  |  |  |  |  |  |  |
Number of lawyers representing individual plaintiffs | lawyer |  | 30 |  |  |  |  |  |  |  |
Litigation settlement, fee expense accrued |  |  |  |  |  | 3,500 |  |  |  |
Tort-Related Legal Claims | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 835 |  |  |  |  |  |  |  |  |
Maui Wildfire Negligence | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Excess liability insurance |  |  |  |  |  | 165,000 |  |  |  |
Miscellaneous professional liability |  |  |  |  |  | 25,000 |  |  |  |
Excess liability insurance, retention amount |  |  |  |  |  | 300 |  |  |  |
Miscellaneous liability insurance, retention amount |  |  |  |  |  | 1,000 |  |  |  |
Directors and officers liability insurance |  |  |  |  |  | 145,000 |  |  |  |
Directors and officers liability insurance, retention |  |  |  |  |  | 1,000 |  |  |  |
Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of pending claims | claim | 1 |  |  |  |  |  |  |  |  |
Shareholder Derivative Actions, District Of Hawaii |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  |  |  | 2 |  |  | 2 |  |
Shareholder Derivative Actions, Northern District Of California |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  |  | 3 |  |  |  |  |  |
County Of Maui | Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 1 |  |  |  |  |  |  |  |  |
Spectrum Oceanic LLC | Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 1 |  |  |  |  |  |  |  |  |
Subrogation Insurers | Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases filed by subrogation insurers | plaintiff | 160 |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  |  |  | 8,600 | $ 0 |  |  |
Settlement accrual, current liability |  | $ 479,000 |  |  |  | 478,750 |  |  | 478,750 |
Settlement payments reserved |  |  |  |  |  | 500,000 |  |  |  |
Settlement accrual, non-current liabilities |  |  |  |  |  | 1,436,250 |  |  | $ 1,436,250 |
Hawaiian Electric Company, Inc. and Subsidiaries | Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  |  |  | 49,000 |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Indemnification Agreement |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement accrual |  |  |  |  |  |  | $ 10,600 |  |  |
Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Expected funding amount |  |  |  |  |  |  |  |  |  | $ 175,000
Expected beneficiary amount |  |  |  |  |  |  |  |  |  | $ 1,500
Natural Disasters and Other Casualty Events | Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Amount agreed to contribute |  | $ 1,990,000 |  |  |  |  |  |  |  |
Settlement funds | fund |  | 2 |  |  |  |  |  |  |  |
Installment payments | installment |  | 4 |  |  |  |  |  |  |  |
Discount rate |  | 5.50% |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Total Defendants | Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Amount agreed to contribute |  | $ 4,040,000 |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 68,200 |  |  |  |
Committed contribution to humanitarian fund |  | $ 75,000 |  |  |  | 75,000 |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Insurance receivable |  |  |  |  |  | $ 40,000 |  |  |  |

X
- Definition Humanitarian Aid Fund, Committed Contribution + References No definition available. + Details
Name: | he_HumanitarianAidFundCommittedContribution
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Insurance Reimbursement Receivable + References No definition available. + Details
Name: | he_InsuranceReimbursementReceivable
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Litigation Settlement, Amount Awarded To Other Party, Number Of Installments + References No definition available. + Details
Name: | he_LitigationSettlementAmountAwardedToOtherPartyNumberOfInstallments
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Litigation Settlement, Amount Awarded To Other Party, Number Of Settlement Funds + References No definition available. + Details
Name: | he_LitigationSettlementAmountAwardedToOtherPartyNumberOfSettlementFunds
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Litigation Settlement, Amount Awarded To Other Party, Reserved To Resolve Claims By Nonparticipating Plaintiffs + References No definition available. + Details
Name: | he_LitigationSettlementAmountAwardedToOtherPartyReservedToResolveClaimsByNonparticipatingPlaintiffs
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Litigation Settlement, Discount Rate + References No definition available. + Details
Name: | he_LitigationSettlementDiscountRate
Namespace Prefix: | he_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Litigation Settlement, Fee Expense Accrued + References No definition available. + Details
Name: | he_LitigationSettlementFeeExpenseAccrued
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loss Contingency, Directors And Officers Liability Insurance + References No definition available. + Details
Name: | he_LossContingencyDirectorsAndOfficersLiabilityInsurance
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Contingency, Directors And Officers Liability Insurance, Retention Amount + References No definition available. + Details
Name: | he_LossContingencyDirectorsAndOfficersLiabilityInsuranceRetentionAmount
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Contingency, Excess Liability Insurance + References No definition available. + Details
Name: | he_LossContingencyExcessLiabilityInsurance
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Contingency, Excess Liability Insurance, Retention Amount + References No definition available. + Details
Name: | he_LossContingencyExcessLiabilityInsuranceRetentionAmount
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Contingency, Miscellaneous Professional Liability Insurance + References No definition available. + Details
Name: | he_LossContingencyMiscellaneousProfessionalLiabilityInsurance
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Contingency, Miscellaneous Professional Liability Insurance, Retention Amount + References No definition available. + Details
Name: | he_LossContingencyMiscellaneousProfessionalLiabilityInsuranceRetentionAmount
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Contingency, Number Of Lawyers Representing Plaintiffs + References No definition available. + Details
Name: | he_LossContingencyNumberOfLawyersRepresentingPlaintiffs
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss Contingency, Property Insurance Coverage + References No definition available. + Details
Name: | he_LossContingencyPropertyInsuranceCoverage
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loss Contingency, Property Insurance Policy Limit + References No definition available. + Details
Name: | he_LossContingencyPropertyInsurancePolicyLimit
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Contingency, Property Insurance Policy Limit, Retention For Generation Assets + References No definition available. + Details
Name: | he_LossContingencyPropertyInsurancePolicyLimitRetentionForGenerationAssets
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unusual Or Infrequent Item, Humanitarian Aid, Expected Beneficiary Amount + References No definition available. + Details
Name: | he_UnusualOrInfrequentItemHumanitarianAidExpectedBeneficiaryAmount
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unusual Or Infrequent Item, Humanitarian Aid, Expected Funding Amount + References No definition available. + Details
Name: | he_UnusualOrInfrequentItemHumanitarianAidExpectedFundingAmount
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_InsuranceRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-10 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
Name: | us-gaap_LossContingencyAccrualCarryingValueCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
Name: | us-gaap_LossContingencyAccrualCarryingValueNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of claims settled. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-9 + Details
Name: | us-gaap_LossContingencyClaimsSettledNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-9 + Details
Name: | us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-9 + Details
Name: | us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-9 + Details
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-3 + Details
Name: | us-gaap_LossContingencyReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=he_InsuranceClaimsLegalRelatedRecoveriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=he_TortRelatedLegalClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_LossFromCatastrophesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=he_MauiWildfireNegligenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=he_ShareholderDerivativeActionsDistrictOfHawaiiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=he_ShareholderDerivativeActionsNorthernDistrictOfCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=he_CountyOfMauiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=he_SpectrumOceanicLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=he_SubrogationInsurersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_HawaiianElectricCompanyAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_CounterpartyNameAxis=he_HawaiianElectricCompanyIncAndOtherDefendantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |