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Electric utility segment - Regulatory Proceedings (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 23, 2020 USD ($) | Nov. 30, 2021 agreement | Dec. 31, 2022 USD ($) MWh project contract | Dec. 31, 2019 USD ($) contract | Jun. 30, 2022 USD ($) | Jun. 17, 2022 mechanism staff | Feb. 28, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 23, 2021 mechanism | Feb. 16, 2021 contract | Dec. 31, 2020 entity | Jul. 09, 2020 agreement
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
PUC proposal period | 45 days |  |  |  |  |  |  |  |  |  |  |
Public utilities, modified pilot process proposal period |  |  | 15 days |  |  |  |  |  |  |  |  |
Pilot process annual cap |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Advanced metering infrastructure utilization PIM, annual maximum reward |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Advanced metering infrastructure utilization PIM, duration |  |  | 3 years |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of performance incentive mechanisms of concern | mechanism |  |  |  |  |  | 11 |  |  |  |  |  |
Number of staff proposing penalty-only PIMs | staff |  |  |  |  |  | 7 |  |  |  |  |  |
Number of performance incentive mechanisms | mechanism |  |  |  |  |  | 2 |  |  | 2 |  |  |
Number of performance incentive mechanisms, penalty-only | mechanism |  |  |  |  |  | 1 |  |  |  |  |  |
Multi-year rate period | 5 years |  |  |  |  |  |  |  |  |  |  |
Customer dividend, negative adjustment percentage | 0.0022% |  |  |  |  |  |  |  |  |  |  |
Savings commitment liability, annual rate | $ 6,600 |  |  |  |  |  |  |  |  |  |  |
Actual return on equity, dead band percentage, above or below target |  |  | 3.00% |  |  |  |  |  |  |  |  |
Authorized ROE |  |  | 9.50% |  |  |  |  |  |  |  |  |
Actual earnings, above or below dead band |  |  | 1.50% |  |  |  |  |  |  |  |  |
Percentage sharing between customers and utilities |  |  | 0.50 |  |  |  |  |  |  |  |  |
Percentage sharing for any further difference |  |  | 0.90 |  |  |  |  |  |  |  |  |
MPIR and EPRM requested amount |  |  | $ 26,200 |  |  |  |  |  |  |  |  |
EPRM number of projects approved | contract |  |  | 2 |  |  |  |  |  |  |  |  |
EPRM project costs |  |  | $ 41,000 |  |  |  |  |  |  |  |  |
EPRM number of projects | project |  |  | 6 |  |  |  |  |  |  |  |  |
EPRM total project costs |  |  | $ 472,000 |  |  |  |  |  |  |  |  |
2021 deferred cost recovery approved |  |  |  |  |  |  | $ 100 |  |  |  |  |
Target performance historical measurement period |  |  | 10 years |  |  |  |  |  |  |  |  |
Service reliability, maximum penalty, percent of return on equity |  |  | 20.00% |  |  |  |  |  |  |  |  |
Maximum penalty, pending adjusted amount |  |  | $ 6,800 |  |  |  |  |  |  |  |  |
Service reliability, estimated penalties |  |  | $ (100) |  |  |  |  |  |  |  |  |
Dead band percentage above or below target |  |  | 3.00% |  |  |  |  |  |  |  |  |
Call center performance, maximum penalty, percent |  |  | 8.00% |  |  |  |  |  |  |  |  |
Call center performance, maximum penalty, pending adjusted amount |  |  | $ 1,400 |  |  |  |  |  |  |  |  |
Number of contracts which qualified for incentives | contract |  |  |  | 7 |  |  |  |  |  |  |  |
Public utility, incentives accrued |  |  |  | $ 1,700 |  |  |  | $ 100 |  |  |  |
Number of grid service purchase agreements | agreement |  |  |  |  |  |  |  |  |  |  |  | 2
Number of additional power purchase contracts | contract |  |  |  |  |  |  |  |  |  | 1 |  |
Number of power purchase contracts approved | agreement |  | 2 |  |  |  |  |  |  |  |  |  |
Number of GSPAs approved | entity |  |  |  |  |  |  |  |  |  |  | 2 |
Interpolated statutory RPS goal rate, years 2021 and 2022 | MWh |  |  | 20 |  |  |  |  |  |  |  |  |
Interpolated statutory RPS goal rate, year 2023 | MWh |  |  | 15 |  |  |  |  |  |  |  |  |
Interpolated statutory RPS goal rate, remainder of MRP | MWh |  |  | 10 |  |  |  |  |  |  |  |  |
Penalty rate for failure to meet RPS targets (megawatt per hour) | MWh |  |  | 20 |  |  |  |  |  |  |  |  |
Grid services procurement PIM, maximum reward |  |  | $ 1,500 |  |  |  |  |  |  |  |  |
Public utilities, grid services procurement performance incentive mechanism, accrued estimated rewards |  |  | 40 |  |  |  |  |  |  |  |  |
Interconnection approval PIM, annual maximum reward |  |  | 3,000 |  |  |  |  |  |  |  |  |
Interconnection approval PIM, annual maximum penalty |  |  | 900 |  |  |  |  |  |  |  |  |
Interconnection approval PIM, accrued estimated rewards |  |  | 3,000 |  |  |  |  |  |  |  |  |
Low-to-moderate income energy efficiency PIM, rewards cap |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Low-to-moderate income energy efficiency PIM, duration |  |  | 3 years |  |  |  |  |  |  |  |  |
Performance incentive mechanism, accrued estimated rewards |  |  |  |  | $ 400 |  |  |  |  |  |  |
Target performance historical measurement period |  |  | 10 years |  |  |  |  |  |  |  |  |
Pending adjusted amount |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Target performance period |  |  | 10 months |  |  |  |  |  |  |  |  |
Target deadband period |  |  | 2 months |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  | $ 3,400 |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Schofield Generation Station |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Major project interim recovery requested amount |  |  | 16,500 |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | West Loch PV Project |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Major project interim recovery requested amount |  |  | 3,500 |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Grid Modernization Strategy Phase 1 Project |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Major project interim recovery requested amount |  |  | 6,100 |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Waiawa UFLS Project |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
EPRM requested amount |  |  | $ 100 |  |  |  |  |  |  |  |  |
Hawaiian Electric |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public utilities retained percentage |  |  | 20.00% |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  | $ 2,400 |  |  |  |  |  |  |  |  |
Hawaii Electric Light |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  | 500 |  |  |  |  |  |  |  |  |
Maui Electric |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  | $ 500 |  |  |  |  |  |  |  |  |

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

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- Definition Public Utility, Number Of Contracts Which Qualified For Incentives Under Phase 1 + References No definition available. + Details
Name: | he_PublicUtilityNumberOfContractsWhichQualifiedForIncentivesUnderPhase1
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
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: |

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- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=he_SchofieldGenerationStationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=he_WestLochPVProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=he_GridModernizationStrategyPhase1ProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=he_WaiawaUFLSProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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