Consolidated Statements of 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
Revenues	$ 799,180	$ 833,239	$ 795,417	$ 792,014	$ 853,424	$ 800,899	$ 798,800	$ 834,380	$ 3,219,850	$ 3,287,503	$ 3,420,917
Expenses
Total expenses									4,926,610	3,012,511	3,141,362
Operating income (loss)	53,662	(149,720)	(1,661,589)	50,887	74,331	62,552	68,111	69,998	(1,706,760)	274,992	279,555
Allowance for equity funds used during construction									13,786	15,164	10,574
Retirement defined benefits credit—other than service costs									3,754	4,014	3,688
Allowance for borrowed funds used during construction									5,470	5,201	3,416
Interest income									19,362	9,105	0
Income (loss) from continuing operations before income taxes									(1,791,595)	182,300	201,954
Income tax expense (benefit)									(470,962)	34,534	38,915
Income (loss) from continuing operations									(1,424,119)	201,128	243,028
Preferred stock dividends of Hawaiian Electric									1,890	1,890	1,890
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
Hawaiian Electric Company, Inc. and Subsidiaries
Revenues									3,206,700	3,269,521	3,408,587
Expenses
Fuel oil									1,078,045	1,211,420	1,265,614
Purchased power									703,371	671,769	793,584
Other operation and maintenance									609,672	533,557	497,601
Provision for tort-related claims									1,875,000	0	0
Depreciation									251,142	243,705	235,424
Taxes, other than income taxes									301,328	306,912	317,173
Total expenses									4,818,558	2,967,363	3,109,396
Operating income (loss)									(1,611,858)	302,158	299,191
Allowance for equity funds used during construction									13,786	15,164	10,574
Retirement defined benefits credit—other than service costs									4,137	4,303	3,835
Interest expense and other charges, net									(82,082)	(86,140)	(76,416)
Allowance for borrowed funds used during construction									5,470	5,201	3,416
Interest income									6,633	6,454	0
Income (loss) from continuing operations before income taxes									(1,663,914)	247,140	240,600
Income tax expense (benefit)									(439,547)	51,193	49,676
Loss from continuing operations									(1,224,367)	195,947	190,924
Preferred stock dividends of subsidiaries									915	915	915
Income (loss) from continuing operations									(1,225,282)	195,032	190,009
Preferred stock dividends of Hawaiian Electric									1,080	1,080	1,080
Net income (loss) for common stock									$ (1,226,362)	$ 193,952	$ 188,929