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, 2020			109,181,000	17,324,000
Beginning balance at Dec. 31, 2020	$ 2,337,502	$ 2,141,918	$ 1,678,368	$ 115,515	$ 746,987	$ 660,398	$ 1,282,335	$ (1,264)	$ (2,919)
Increase (decrease) in stockholders' equity
Net income for common stock	64,358	43,358				64,358	43,358
Other comprehensive (loss) income, net of taxes/benefits	(44,016)	34						(44,016)	34
Common stock dividends	(37,156)	(27,925)				(37,156)	(27,925)
Ending balance (in shares) at Mar. 31, 2021			109,281,000	17,324,000
Ending balance at Mar. 31, 2021	$ 2,321,293	2,157,385	$ 1,678,973	$ 115,515	746,987	687,600	1,297,768	(45,280)	(2,885)
Beginning balance (in shares) at Dec. 31, 2021	109,311,785		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 taxes/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	109,431,346		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)