Condensed Consolidated Statements of Changes in Common Stock Equity (unaudited) - HECO - USD ($) $ in Thousands	Total	Hawaiian Electric Company, Inc. and Subsidiaries	Common stock	Common stock Hawaiian Electric Company, Inc. and Subsidiaries	Premium on capital stock Hawaiian Electric Company, Inc. and Subsidiaries	Retained earnings	Retained earnings Hawaiian Electric Company, Inc. and Subsidiaries	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Hawaiian Electric Company, Inc. and Subsidiaries
Beginning balance (in shares) at Dec. 31, 2021			109,312,000	17,753,000
Beginning balance at Dec. 31, 2021	$ 2,390,884	$ 2,261,899	$ 1,685,496	$ 118,376	$ 798,526	$ 757,921	$ 1,348,277	$ (52,533)	$ (3,280)
Increase (decrease) in stockholders' equity
Net income for common stock	69,167	46,409				69,167	46,409
Other comprehensive (loss) income, net of tax benefits	(117,159)	51						(117,159)	51
Common stock dividends	(38,301)	(31,475)				(38,301)	(31,475)
Ending balance (in shares) at Mar. 31, 2022			109,431,000	17,753,000
Ending balance at Mar. 31, 2022	2,303,642	2,276,884	$ 1,684,547	$ 118,376	798,526	788,787	1,363,211	(169,692)	(3,229)
Beginning balance (in shares) at Dec. 31, 2021			109,312,000	17,753,000
Beginning balance at Dec. 31, 2021	2,390,884	2,261,899	$ 1,685,496	$ 118,376	798,526	757,921	1,348,277	(52,533)	(3,280)
Increase (decrease) in stockholders' equity
Net income for common stock	183,790	140,308
Other comprehensive (loss) income, net of tax benefits	(301,011)	210
Common stock dividends		(94,425)
Ending balance (in shares) at Sep. 30, 2022			109,470,000	17,753,000
Ending balance at Sep. 30, 2022	2,162,922	2,307,992	$ 1,689,672	$ 118,376	798,526	826,794	1,394,160	(353,544)	(3,070)
Beginning balance (in shares) at Mar. 31, 2022			109,431,000	17,753,000
Beginning balance at Mar. 31, 2022	2,303,642	2,276,884	$ 1,684,547	$ 118,376	798,526	788,787	1,363,211	(169,692)	(3,229)
Increase (decrease) in stockholders' equity
Net income for common stock	52,541	44,135				52,541	44,135
Other comprehensive (loss) income, net of tax benefits	(87,840)	51						(87,840)	51
Common stock dividends	(38,301)	(31,475)				(38,301)	(31,475)
Ending balance (in shares) at Jun. 30, 2022			109,467,000	17,753,000
Ending balance at Jun. 30, 2022	2,233,504	2,289,595	$ 1,688,009	$ 118,376	798,526	803,027	1,375,871	(257,532)	(3,178)
Increase (decrease) in stockholders' equity
Net income for common stock	62,082	49,764				62,082	49,764
Other comprehensive (loss) income, net of tax benefits	(96,012)	108						(96,012)	108
Common stock dividends	(38,315)	(31,475)				(38,315)	(31,475)
Ending balance (in shares) at Sep. 30, 2022			109,470,000	17,753,000
Ending balance at Sep. 30, 2022	$ 2,162,922	2,307,992	$ 1,689,672	$ 118,376	798,526	826,794	1,394,160	(353,544)	(3,070)
Beginning balance (in shares) at Dec. 31, 2022	109,470,795		109,471,000	17,854,000
Beginning balance at Dec. 31, 2022	$ 2,202,499	2,344,170	$ 1,692,697	$ 119,048	810,955	845,830	1,411,306	(336,028)	2,861
Increase (decrease) in stockholders' equity
Net income for common stock	54,721	47,009				54,721	47,009
Other comprehensive (loss) income, net of tax benefits	20,488	(45)						20,488	(45)
Common stock dividends	(39,446)	(32,250)				(39,446)	(32,250)
Ending balance (in shares) at Mar. 31, 2023			109,572,000	17,854,000
Ending balance at Mar. 31, 2023	$ 2,237,955	2,358,884	$ 1,692,390	$ 119,048	810,955	861,105	1,426,065	(315,540)	2,816
Beginning balance (in shares) at Dec. 31, 2022	109,470,795		109,471,000	17,854,000
Beginning balance at Dec. 31, 2022	$ 2,202,499	2,344,170	$ 1,692,697	$ 119,048	810,955	845,830	1,411,306	(336,028)	2,861
Increase (decrease) in stockholders' equity
Net income for common stock	150,449	135,769
Other comprehensive (loss) income, net of tax benefits	$ (21,996)	(166)
Common stock dividends		(96,750)
Ending balance (in shares) at Sep. 30, 2023	110,086,035		110,086,000	17,854,000
Ending balance at Sep. 30, 2023	$ 2,224,354	2,383,023	$ 1,704,447	$ 119,048	810,955	877,931	1,450,325	(358,024)	2,695
Beginning balance (in shares) at Mar. 31, 2023			109,572,000	17,854,000
Beginning balance at Mar. 31, 2023	2,237,955	2,358,884	$ 1,692,390	$ 119,048	810,955	861,105	1,426,065	(315,540)	2,816
Increase (decrease) in stockholders' equity
Net income for common stock	54,610	45,299				54,610	45,299
Other comprehensive (loss) income, net of tax benefits	(7,609)	(44)						(7,609)	(44)
Common stock dividends	(39,447)	(32,250)				(39,447)	(32,250)
Ending balance (in shares) at Jun. 30, 2023			109,612,000	17,854,000
Ending balance at Jun. 30, 2023	2,249,377	2,371,889	$ 1,696,258	$ 119,048	810,955	876,268	1,439,114	(323,149)	2,772
Increase (decrease) in stockholders' equity
Net income for common stock	41,118	43,461				41,118	43,461
Other comprehensive (loss) income, net of tax benefits	(34,875)	(77)						(34,875)	(77)
Common stock dividends	$ (39,455)	(32,250)				(39,455)	(32,250)
Ending balance (in shares) at Sep. 30, 2023	110,086,035		110,086,000	17,854,000
Ending balance at Sep. 30, 2023	$ 2,224,354	$ 2,383,023	$ 1,704,447	$ 119,048	$ 810,955	$ 877,931	$ 1,450,325	$ (358,024)	$ 2,695