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Maui windstorm and wildfires - Narrative (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 08, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) claim | Nov. 08, 2023 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |
Property insurance policy limit | $ 500.0 |  |  |
Retention for property damages | $ 1.0 |  |  |
Lawsuit claim filed | claim |  |  | 1 |
Natural Disasters and Other Casualty Events | Subsequent Event |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Expected funding amount |  |  |  | $ 150.0
Expected beneficiary amount |  |  |  | $ 1.0
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Percentage of electric service restored |  |  | 95.00% |
Hawaiian Electric Company, Inc. and Subsidiaries | Natural Disasters and Other Casualty Events |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Committed contribution to humanitarian fund |  | $ 75.0 | $ 75.0 |
Insurance reimbursement receivable |  | 75.0 | 75.0 |
Maui Windstorm and Wildfires | Natural Disasters and Other Casualty Events |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Incremental expenses |  |  | 27.6 |
Maui Windstorm and Wildfires | Hawaiian Electric Company, Inc. and Subsidiaries | Natural Disasters and Other Casualty Events |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Incremental expenses |  |  | $ 8.0 |
Maui Windstorm and Wildfires | Maui Wildfire Negligence |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Legal expenses |  | 10.8 |  |
Excess liability insurance |  | 165.0 |  |
Excess liability insurance, retention amount |  | 1.5 |  |
Maui Windstorm and Wildfires | Maui Wildfire Negligence | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Legal expenses |  | $ 6.3 |  |

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