Electric utility segment - Regulatory Assets and Liability (Details) - Hawaiian Electric Company, Inc. and Subsidiaries - USD ($) $ in Millions |
Dec. 31, 2025 |
Jun. 30, 2026 |
|---|---|---|
| Wildfire Mitigation Plan (WMP) (to be determined by the PUC) | ||
| Regulatory Projects and Legal Obligations [Line Items] | ||
| Regulatory assets | $ 21.4 | |
| Target reduction risk, period | 3 years | |
| Suspension of Disconnections | ||
| Regulatory Projects and Legal Obligations [Line Items] | ||
| Regulatory assets | 7.1 | |
| Natural Disasters and Other Casualty Events | ||
| Regulatory Projects and Legal Obligations [Line Items] | ||
| Regulatory assets | $ 80.5 |