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Electric utility segment - Most recent rate proceedings (Details) - Hawaiian Electric Company, Inc. and Subsidiaries $ in Millions				1 Months Ended
	Jun. 09, 2022 USD ($)	Mar. 01, 2022 USD ($)	Oct. 30, 2020 USD ($) installation	Dec. 31, 2021 USD ($)
Regulatory Projects and Legal Obligations [Line Items]
Recovery of deferral costs	$ 27.8
Recovery of deferral costs period	3 years
Public utilities, electric distribution system, contract period		50 years	50 years
Number of U.S. army installations being serviced | installation			12
Purchase price		$ 14.5
price of acquisition, expected			$ 4.0
Transition period		1 year
Capital upgrade over the period		6 years
COVID-19
Regulatory Projects and Legal Obligations [Line Items]
Customer bill forgiveness				$ 2.0

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Customer Bill Forgiveness

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