Consolidated Statements of Comprehensive Income - HECO - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net income (loss) for common stock	$ (68,245)	$ (104,402)	$ (1,295,484)	$ 42,122	$ 48,789	$ 41,118	$ 54,610	$ 54,721	$ (1,426,009)	$ 199,238	$ 241,138
Retirement benefit plans:
Net gains arising during the period, net of taxes of $22,780, $3,529 and $64,925 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 $(706), $(688) and $6,550 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)
Hawaiian Electric Company, Inc. and Subsidiaries
Net income (loss) for common stock									(1,226,362)	193,952	188,929
Retirement benefit plans:
Net gains arising during the period, net of taxes of $22,780, $3,529 and $64,925 for 2024, 2023 and 2022, respectively									65,680	10,175	187,193
Adjustment for amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost, net of taxes of $(706), $(688) and $6,550 for 2024, 2023 and 2022, respectively									(2,035)	(1,983)	18,884
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									(63)	(12)	6,141
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc.									$ (1,226,425)	$ 193,940	$ 195,070