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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, 2022	Mar. 31, 2021
Increase (decrease) in stockholders' equity
Beginning balance	$ 2,390,884	$ 2,337,502
Net income for common stock	69,167	64,358
Other comprehensive income, net of taxes	(117,159)	(44,016)
Common stock dividends	(38,301)	(37,156)
Ending balance	2,303,642	2,321,293
Hawaiian Electric Consolidated
Increase (decrease) in stockholders' equity
Beginning balance	2,261,899	2,141,918
Net income for common stock	46,409	43,358
Other comprehensive income, net of taxes	51	34
Common stock dividends	(31,475)	(27,925)
Ending balance	2,276,884	2,157,385
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric Industries, Inc.
Increase (decrease) in stockholders' equity
Beginning balance	2,261,899	2,141,918
Net income for common stock	46,409	43,358
Other comprehensive income, net of taxes	51	34
Common stock dividends	(31,475)	(27,925)
Ending balance	2,276,884	2,157,385
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light
Increase (decrease) in stockholders' equity
Beginning balance	332,900	317,451
Net income for common stock	7,377	6,692
Other comprehensive income, net of taxes	0	1
Common stock dividends	(4,100)	(3,650)
Ending balance	336,177	320,494
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric
Increase (decrease) in stockholders' equity
Beginning balance	343,260	309,363
Net income for common stock	6,284	5,818
Other comprehensive income, net of taxes	0	0
Common stock dividends	(3,800)	(3,776)
Ending balance	345,744	311,405
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 income, net of taxes	0	0
Ending balance	77	77
Hawaiian Electric Consolidated | Consolidating adjustments
Increase (decrease) in stockholders' equity
Beginning balance	(676,237)	(626,891)
Net income for common stock	(13,661)	(12,510)
Other comprehensive income, net of taxes	0	(1)
Common stock dividends	7,900	7,426
Ending balance	$ (681,998)	$ (631,976)

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