Consolidated Statements of Changes in Common Stock Equity - HECO - USD ($) $ in Thousands	Total	Common stock	Retained earnings (deficit)	Accumulated other comprehensive income (loss)	Hawaiian Electric Company, Inc. and Subsidiaries	Hawaiian Electric Company, Inc. and Subsidiaries Common stock	Hawaiian Electric Company, Inc. and Subsidiaries Premium on capital stock	Hawaiian Electric Company, Inc. and Subsidiaries Retained earnings (deficit)	Hawaiian Electric Company, Inc. and Subsidiaries Additional paid-in capital	Hawaiian Electric Company, Inc. and Subsidiaries Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Dec. 31, 2021		109,312,000				17,753,000
Beginning balance at Dec. 31, 2021	$ 2,390,884	$ 1,685,496	$ 757,921	$ (52,533)	$ 2,261,899	$ 118,376	$ 798,526	$ 1,348,277	$ 0	$ (3,280)
Increase (decrease) in stockholders' equity
Net income (loss) for common stock	241,138		241,138		188,929			188,929
Other comprehensive income (loss), net of taxes	(283,495)			(283,495)	6,141					6,141
Issuance of common stock, net of expenses (in shares)						101,000
Issuance of common stock, net of expenses					13,101	$ 672	12,429
Common stock dividends	(153,229)		(153,229)		(125,900)			(125,900)
Ending balance (in shares) at Dec. 31, 2022		109,471,000				17,854,000
Ending balance at Dec. 31, 2022	2,202,499	$ 1,692,697	845,830	(336,028)	2,344,170	$ 119,048	810,955	1,411,306	0	2,861
Increase (decrease) in stockholders' equity
Net income (loss) for common stock	199,238		199,238		193,952			193,952
Other comprehensive income (loss), net of taxes	46,678			46,678	(12)					(12)
Common stock dividends	$ (118,348)		(118,348)		(129,000)			(129,000)
Ending balance (in shares) at Dec. 31, 2023	110,151,798	110,152,000				17,854,000
Ending balance at Dec. 31, 2023	$ 2,344,841	$ 1,707,471	926,720	(289,350)	2,409,110	$ 119,048	810,955	1,476,258	0	2,849
Increase (decrease) in stockholders' equity
Net income (loss) for common stock	(1,426,009)		(1,426,009)		(1,226,362)			(1,226,362)
Other comprehensive income (loss), net of taxes	3,184			3,184	(63)					(63)
Issuance of common stock, net of expenses (in shares)		62,162,000
Issuance of common stock, net of expenses	575,000	$ 575,000
Common stock dividends					(26,000)			(26,000)
Additional paid-in capital	$ 270				270				270
Ending balance (in shares) at Dec. 31, 2024	172,465,608	172,466,000				17,854,000
Ending balance at Dec. 31, 2024	$ 1,479,089	$ 2,264,544	$ (788,916)	$ 3,461	$ 1,156,955	$ 119,048	$ 810,955	$ 223,896	$ 270	$ 2,786