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Electric utility segment - Utility Projects (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2019 USD ($) MW | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 30, 2021 USD ($) | Oct. 31, 2020 transmission_line generationUnit kV | Jun. 10, 2019 USD ($) | Oct. 31, 2018 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Operating lease right-of-use-assets |  | $ 115,684,000 | $ 122,416,000 |  |  |  |
Valuation allowances and reserves, statement of financial position, not disclosed |  | reserve account balance |  |  |  |  |
Federal |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Tax credit deferral period |  | 25 years |  |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Tax credit deferral period |  | 10 years |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Operating lease right-of-use-assets |  | $ 89,318,000 | $ 101,470,000 |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | ERP/EAM Implementation Project |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
ERP/EAM project service period (in years) |  | 12 years |  |  |  |  |
ERP/EAM required pass-through savings |  |  |  |  |  |  | $ 246,000,000
ERP/EAM implementation project, expected future O&M expense reductions |  |  |  |  |  | $ 150,000,000 |
ERP/EAM implementation project, future cost avoidance related to capital costs and tax costs |  |  |  |  |  | $ 96,000,000 |
ERP/EAM regulatory liability for operation and maintenance expense reductions |  | $ 10,500,000 |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | West Loch PV Project |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Solar project, energy production (in megawatts) | MW | 20 |  |  |  |  |  |
Solar project, project cap | $ 67,000,000 |  |  |  |  |  |
Solar project, project cap for in-kind work | $ 4,700,000 |  |  |  |  |  |
Solar project, cost incurred |  | 60,500,000 |  |  |  |  |
Federal nonrefundable tax credits |  | 14,700,000 |  |  |  |  |
State nonrefundable tax credits |  | 14,000,000 |  |  |  |  |
Operating lease right-of-use-assets |  | 6,400,000 |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Waena Switchyard/Synchronous Condenser Project |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Number of extended transmission lines | transmission_line |  |  |  |  | 2 |  |
Number of kilovolts | kV |  |  |  |  | 69 |  |
Number of generating units converting to synchronous condensers | generationUnit |  |  |  |  | 2 |  |
Renewable energy generation project, approved funds |  |  |  | $ 38,800,000 |  |  |
Renewable energy generation project, incurred cost |  | 13,200,000 |  |  |  |  |
Hawaiian Electric | PCB Contamination |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Valuation allowances and reserves |  | 9,900,000 |  |  |  |  |
Hawaiian Electric | ERP/EAM Implementation Project |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
ERP/EAM regulatory liability for operation and maintenance expense reductions |  | 4,000,000 |  |  |  |  |
Hawaii Electric Light | ERP/EAM Implementation Project |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
ERP/EAM regulatory liability for operation and maintenance expense reductions |  | 2,600,000 |  |  |  |  |
Maui Electric |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Additional accrued investigation and estimated cleanup costs |  | 2,600,000 |  |  |  |  |
Maui Electric | ERP/EAM Implementation Project |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
ERP/EAM regulatory liability for operation and maintenance expense reductions |  | $ 3,900,000 |  |  |  |  |
Regulatory liability, amortization period |  | 5 years |  |  |  |  |

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