Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss) for common stock	$ (1,295,484)	$ 54,610	$ (1,253,362)	$ 109,331
Net unrealized gains (losses) on available-for-sale investment securities:
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of taxes of $(617), $(4,021), $(5,592) and $2,058, respectively	(1,686)	(10,984)	(15,275)	5,621
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes of $1,205, $1,350, $2,334 and $2,696, respectively	3,288	3,689	6,374	7,366
Derivatives qualifying as cash flow hedges:
Unrealized interest rate hedging gains (losses) arising during the period, net of taxes of $11, $(117), $267 and $(52), respectively	29	(335)	769	(149)
Reclassification adjustment to net income, net of taxes of $(18), $(16), $(34) and $(33), respectively	(51)	(48)	(99)	(96)
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 $(155), $(122), $(309) and $(244), respectively	(445)	(357)	(894)	(714)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $160, $148, $319 and $295, respectively	459	426	918	851
Other comprehensive loss, net of taxes	1,594	(7,609)	(8,207)	12,879
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc.	$ (1,293,890)	$ 47,001	$ (1,261,569)	$ 122,210