Electric utility segment - Regulatory Assets for COVID-19 Related Costs (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Jun. 09, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Regulatory Projects and Legal Obligations [Line Items]
Bill credits				$ 2,000
Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory Projects and Legal Obligations [Line Items]
Recovery of deferral costs	$ 27,800
Recovery of deferral costs period	3 years
Hawaiian Electric Company, Inc. and Subsidiaries | COVID-19
Regulatory Projects and Legal Obligations [Line Items]
Bill credits		$ 2,000
Public utilities in regulatory assets			$ 11,400