Electric utility segment - Regulatory Assets for Suspension of Disconnections Related Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Regulatory Projects and Legal Obligations [Line Items]
Regulatory assets	$ 231,197	$ 242,513
Hawaiian Electric Company, Inc. and Subsidiaries \| Suspension Of Disconnections
Regulatory Projects and Legal Obligations [Line Items]
Regulatory assets	$ 100

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481878/980-340-50-1

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant