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Maui windstorm and wildfires - Narrative (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Nov. 04, 2024 claim plaintiff | Nov. 01, 2024 USD ($) installment claim lawyer | May 04, 2024 USD ($) | Aug. 08, 2023 USD ($) | Oct. 31, 2024 USD ($) | Feb. 08, 2024 claim | Jun. 08, 2024 claim | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Jul. 15, 2024 claim | Nov. 08, 2023 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ (314,247) |  | $ (314,247) |  | $ (294,804) |  |
Property insurance policy limit |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Retention for property damages |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Settlement accrual |  |  |  |  |  |  |  | 1,915,000 |  | 1,915,000 |  | 75,000 |  |
Excess liability insurance |  |  |  |  |  |  |  |  |  | 16,000 |  |  |  |
Miscellaneous professional liability |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Directors and officers liability insurance |  |  |  |  |  |  |  |  |  | 130,000 |  |  |  |
Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  |  |  |  |  | 74,000 |  | 74,000 |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, fee expense accrued |  |  |  |  |  |  |  | 3,500 |  | 3,500 |  |  |  |
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 |  |  |  |
Shareholder Derivative Actions, Northern District Of California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Shareholder Derivative Actions, District Of Hawaii |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Subsequent Event | Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 750 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of settlement agreements | claim |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Number of lawyers representing individual plaintiffs | lawyer |  | 30 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Maui Wildfire Negligence | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pending claims | claim | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Spectrum Oceanic LLC | Maui Wildfire Negligence | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Subrogation Insurers | Maui Wildfire Negligence | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases filed by subrogation insurers | plaintiff | 160 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | County Of Maui | Maui Wildfire Negligence | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement accrual, current liability |  |  |  |  |  |  |  | 478,750 |  | 478,750 |  | 75,000 |  |
Settlement payments reserved |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |
Settlement accrual |  |  |  |  |  |  |  | 1,920,000 |  | 1,920,000 |  |  |  |
Settlement accrual, non-current liabilities |  |  |  |  |  |  |  | 1,436,250 |  | 1,436,250 |  | 0 |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  |  |  |  |  | 69,000 |  | 69,000 |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Indemnification Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement accrual |  |  |  |  |  |  |  | 14,500 |  | 14,500 |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  |  | $ 700 |  |  |  |  |  |  |  |  |
Settlement accrual, current liability |  | $ 479,000 |  |  |  |  |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected funding amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000
Expected beneficiary amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500
Number of claim forms | claim |  |  |  |  |  |  |  |  |  |  |  |  | 35 |
Number of physical injury related claim forms | claim |  |  |  |  |  |  |  |  |  |  |  |  | 12 |
Natural Disasters and Other Casualty Events | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  |  |  |  |  | 52,158 | $ 75,000 | 83,610 | $ 75,000 | 104,580 |  |
Natural Disasters and Other Casualty Events | Subsequent Event | Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount agreed to contribute |  | $ 1,990,000 |  |  |  |  |  |  |  |  |  |  |  |
Installment payments | installment |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Subsequent Event | 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 |  |  |  |  |  |  |  | (38,800) |  | (38,800) |  |  |  |
Committed contribution to humanitarian fund |  |  |  |  |  |  |  | 75,000 |  | 75,000 |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  |  |  |  |  | 49,625 | $ 75,000 | 75,973 | $ 75,000 | $ 98,613 |  |
Incremental expenses |  |  |  |  |  |  |  | 1,200 |  | 8,900 |  |  |  |
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 |  | $ 40,000 |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed contribution to humanitarian fund |  | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |

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