Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss) for common stock	$ (1,426,009)	$ 199,238	$ 241,138
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 $(4,110), $7,536 and $(110,140) for 2024, 2023 and 2022, respectively	(11,227)	20,589	(300,860)
Reclassification adjustment for net realized losses included in net income, net of taxes of nil, $4,011 and nil for 2024, 2023 and 2022, respectively	0	10,954	0
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes of $4,764, $5,271 and $1,462 for 2024, 2023 and 2022, respectively	13,012	14,398	3,993
Derivatives qualified as cash flow hedges:
Unrealized interest rate hedging gains (losses), net of taxes of $237, $(58) and $1,892 for 2024, 2023 and 2022, respectively	683	(167)	5,457
Reclassification adjustment to net income, net of taxes of $(70), $(65) and $60 for 2024, 2023 and 2022, respectively	(201)	(186)	172
Retirement benefit plans:
Net gains arising during the period, net of taxes of $23,015, $3,778 and $65,174 for 2024, 2023 and 2022, respectively	66,355	10,854	188,020
Adjustment for amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost, net of taxes of $(597), $(535) and $6,820 for 2024, 2023 and 2022, respectively	(1,730)	(1,560)	19,659
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $(22,096), $(2,846) and $(69,345) for 2024, 2023 and 2022, respectively	(63,708)	(8,204)	(199,936)
Other comprehensive income (loss), net of taxes	3,184	46,678	(283,495)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc.	$ (1,422,825)	$ 245,916	$ (42,357)