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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Increase (decrease) in stockholders' equity
Beginning balance	$ 2,202,499	$ 2,390,884
Net income for common stock	54,721	69,167
Other comprehensive loss, net of taxes	20,488	(117,159)
Common stock dividends	(39,446)	(38,301)
Ending balance	2,237,955	2,303,642
Hawaiian Electric Consolidated
Increase (decrease) in stockholders' equity
Beginning balance	2,344,170	2,261,899
Net income for common stock	47,009	46,409
Other comprehensive loss, net of taxes	(45)	51
Common stock dividends	(32,250)	(31,475)
Ending balance	2,358,884	2,276,884
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric (parent only)
Increase (decrease) in stockholders' equity
Beginning balance	2,344,170	2,261,899
Net income for common stock	47,009	46,409
Other comprehensive loss, net of taxes	(45)	51
Common stock dividends	(32,250)	(31,475)
Ending balance	2,358,884	2,276,884
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light
Increase (decrease) in stockholders' equity
Beginning balance	344,720	332,900
Net income for common stock	6,390	7,377
Other comprehensive loss, net of taxes	(6)	0
Common stock dividends	(4,475)	(4,100)
Ending balance	346,629	336,177
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric
Increase (decrease) in stockholders' equity
Beginning balance	357,036	343,260
Net income for common stock	5,151	6,284
Other comprehensive loss, net of taxes	(6)	0
Common stock dividends	(3,675)	(3,800)
Ending balance	358,506	345,744
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries
Increase (decrease) in stockholders' equity
Beginning balance	77	77
Net income for common stock	0	0
Other comprehensive loss, net of taxes	0	0
Ending balance	77	77
Hawaiian Electric Consolidated | Consolidating adjustments
Increase (decrease) in stockholders' equity
Beginning balance	(701,833)	(676,237)
Net income for common stock	(11,541)	(13,661)
Other comprehensive loss, net of taxes	12	0
Common stock dividends	8,150	7,900
Ending balance	$ (705,212)	$ (681,998)

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