Condensed Consolidated Statements of Changes in Shareholders' 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, 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	109,572,075		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