Condensed Consolidated Statements of Comprehensive Income (unaudited) - HECO - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Net income (loss) for common stock	$ (104,402)	$ (1,295,484)	$ 42,122	$ 41,118	$ 54,610	$ 54,721	$ (1,357,764)	$ 150,449
Retirement benefit plans:
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(462), $(190), $(813) and $(516), respectively	(1,244)			(446)			(2,138)	(1,160)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $462, $163, $781 and $458, respectively	1,333			470			2,251	1,321
Other comprehensive income (loss), net of taxes	39,360	1,594	(9,801)	(34,875)	(7,609)	20,488	31,153	(21,996)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc.	(65,042)			6,243			(1,326,611)	128,453
Hawaiian Electric Company, Inc. and Subsidiaries
Net income (loss) for common stock	(82,585)	(1,229,394)	39,221	43,461	45,299	47,009	(1,272,758)	135,769
Retirement benefit plans:
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(462), $(190), $(813) and $(516), respectively	(1,331)			(547)			(2,344)	(1,487)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $462, $163, $781 and $458, respectively	1,333			470			2,251	1,321
Other comprehensive income (loss), net of taxes	2	$ (46)	$ (49)	(77)	$ (44)	$ (45)	(93)	(166)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc.	$ (82,583)			$ 43,384			$ (1,272,851)	$ 135,603