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Electric utility segment - Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	$ 267,691	$ 256,069	$ 246,158
Other amortization	43,106	38,772	32,544
Deferred income tax expense (benefit)	5,268	(32,502)	(5,398)
Allowance for equity funds used during construction	(15,164)	(10,574)	(9,534)
Other	(4,342)	(7,580)	(7,060)
Changes in assets and liabilities
Decrease (increase) in fuel oil stock	43,388	(87,569)	(45,819)
Decrease (increase) in regulatory assets	(10,613)	34,600	(13,874)
Increase (decrease) in regulatory liabilities	54,470	44,888	15,358
Change in prepaid and accrued income taxes, tax credits and revenue taxes	(13,247)	121,636	41,331
Decrease in defined benefit pension and other postretirement benefit plans liability	(8,872)	(5,191)	(6,660)
Net cash provided by operating activities	551,471	454,476	375,673
Cash flows from investing activities
Capital expenditures	(448,296)	(344,037)	(314,524)
Other	10,319	13,046	27
Net cash used in investing activities	(257,399)	(1,128,682)	(1,179,592)
Cash flows from financing activities
Common stock dividends	(112,957)	(153,229)	(148,643)
Proceeds from issuance of common stock	1,223	0	0
Proceeds from issuance of long-term debt	625,000	227,312	285,886
Repayment of long-term debt	(167,080)	(221,910)	(82,262)
Net increase (decrease) in other bank borrowings with original maturities of three months or less	(596,810)	606,815	(1,365)
Repayment of short-term debt	(100,000)	0	(65,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(137,650)	83,652	(10,493)
Other	(4,662)	(2,398)	(3,080)
Net cash provided by (used in) financing activities	195,575	567,671	756,402
Net increase (decrease) in cash, cash equivalents and restricted cash	489,647	(106,535)	(47,517)
Cash, cash equivalents and restricted cash, January 1	204,927	311,462	358,979
Cash, cash equivalents and restricted cash, December 31	694,574	204,927	311,462
Less: Restricted cash	(15,028)	(5,050)	(5,911)
Cash and cash equivalents	679,546	199,877	305,551
Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income (loss)	195,947	190,924	179,637
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings of subsidiaries	0	0	0
Common stock dividends received from subsidiaries	0	0	0
Depreciation of property, plant and equipment	243,705	235,424	229,469
Other amortization	26,490	25,320	21,737
Deferred income tax expense (benefit)	1,439	(41,415)	(3,829)
State refundable credit	(11,325)	(10,999)	(10,582)
Bad debt expense	8,161	6,027	2,183
Allowance for equity funds used during construction	(15,164)	(10,574)	(9,534)
Bill credits	0	0	2,000
Other	460	(139)	1,350
Changes in assets and liabilities
Increase in accounts receivable	(65,004)	(91,742)	(50,090)
Increase in accrued unbilled revenues	(3,048)	(54,023)	(27,464)
Decrease (increase) in fuel oil stock	43,293	(87,452)	(45,840)
Increase in materials and supplies	(34,865)	(7,691)	(4,533)
Decrease (increase) in regulatory assets	(10,613)	34,600	(13,874)
Increase (decrease) in regulatory liabilities	54,470	44,888	15,358
Increase in accounts payable	20,454	22,355	17,671
Change in prepaid and accrued income taxes, tax credits and revenue taxes	1,878	103,198	26,930
Decrease in defined benefit pension and other postretirement benefit plans liability	(8,186)	(4,828)	(5,154)
Change in other assets and liabilities	26,275	(25,943)	(52,302)
Net cash provided by operating activities	474,367	327,930	273,133
Cash flows from investing activities
Capital expenditures	(438,775)	(329,457)	(292,000)
Advances to affiliates	0	0	0
Other	6,176	5,372	6,035
Net cash used in investing activities	(432,599)	(324,085)	(285,965)
Cash flows from financing activities
Common stock dividends	(129,000)	(125,900)	(111,700)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(1,995)	(1,995)	(1,995)
Proceeds from issuance of common stock	0	13,101	54,400
Proceeds from issuance of long-term debt	350,000	60,000	115,000
Repayment of long-term debt	(100,000)	(52,000)	0
Net increase (decrease) in other bank borrowings with original maturities of three months or less		87,967	0
Repayment of short-term debt	0	0	(50,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(87,967)	87,967	0
Payments of obligations under finance leases	(3,128)	(670)	0
Other	(843)	(364)	(941)
Net cash provided by (used in) financing activities	27,067	(19,861)	4,764
Net increase (decrease) in cash, cash equivalents and restricted cash	68,835	(16,016)	(8,068)
Cash, cash equivalents and restricted cash, January 1	39,242	55,258	63,326
Cash, cash equivalents and restricted cash, December 31	108,077	39,242	55,258
Less: Restricted cash	(2,000)	0	(3,089)
Cash and cash equivalents	106,077	39,242	52,169
Consolidating adjustments | Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income (loss)	(44,809)	(47,493)	(45,353)
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings of subsidiaries	44,809	47,493	45,353
Common stock dividends received from subsidiaries	(24,450)	(31,600)	(29,700)
Depreciation of property, plant and equipment	0	0	0
Other amortization	0	0	0
Deferred income tax expense (benefit)	0	0	0
State refundable credit	0	0	0
Bad debt expense	0	0	0
Allowance for equity funds used during construction	0	0	0
Bill credits			0
Other	0	0	0
Changes in assets and liabilities
Increase in accounts receivable	55,096	4,649	1,540
Increase in accrued unbilled revenues	0	0	0
Decrease (increase) in fuel oil stock	0	0	0
Increase in materials and supplies	0	0	0
Decrease (increase) in regulatory assets	0	0	0
Increase (decrease) in regulatory liabilities	0	0	0
Increase in accounts payable	0	0	0
Change in prepaid and accrued income taxes, tax credits and revenue taxes	0	0	(86)
Decrease in defined benefit pension and other postretirement benefit plans liability	0	0	0
Change in other assets and liabilities	(55,096)	(4,649)	(1,540)
Net cash provided by operating activities	(24,450)	(31,600)	(29,786)
Cash flows from investing activities
Capital expenditures	0	0	0
Advances to affiliates	44,300	25,200	(25,700)
Other	0	9,046	33,486
Net cash used in investing activities	44,300	34,246	7,786
Cash flows from financing activities
Common stock dividends	24,450	31,600	29,700
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0	0
Proceeds from issuance of common stock		(9,046)	(33,400)
Proceeds from issuance of long-term debt	0	0	0
Repayment of long-term debt	0	0
Net increase (decrease) in other bank borrowings with original maturities of three months or less		(25,200)	25,700
Repayment of short-term debt			0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(44,300)
Payments of obligations under finance leases	0	0
Other	0	0	0
Net cash provided by (used in) financing activities	(19,850)	(2,646)	22,000
Net increase (decrease) in cash, cash equivalents and restricted cash	0	0	0
Cash, cash equivalents and restricted cash, January 1	0	0	0
Cash, cash equivalents and restricted cash, December 31	0	0	0
Less: Restricted cash	0	0	0
Cash and cash equivalents	0	0	0
Hawaiian Electric
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	402	399	414
Changes in assets and liabilities
Net cash provided by operating activities	131,873	167,150	154,151
Cash flows from investing activities
Capital expenditures	(21)	(224)	(10)
Other	610	1,662	180
Net cash used in investing activities	(15,199)	(50,331)	(76,062)
Cash flows from financing activities
Common stock dividends	(112,957)	(153,229)	(148,643)
Proceeds from issuance of common stock	1,223	0	0
Proceeds from issuance of long-term debt	100,000	160,000	150,000
Repayment of long-term debt	(50,000)	(150,000)	(50,000)
Repayment of short-term debt	(100,000)	0	(15,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(49,683)	(4,315)	(10,493)
Other	(771)	(978)	(1,767)
Net cash provided by (used in) financing activities	25,441	(116,687)	(77,909)
Net increase (decrease) in cash, cash equivalents and restricted cash	142,115	132	180
Cash, cash equivalents and restricted cash, January 1	611	479	299
Cash, cash equivalents and restricted cash, December 31	142,726	611	479
Less: Restricted cash	(6,216)	0	0
Cash and cash equivalents	136,510	611	479
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income (loss)	195,032	190,009	178,722
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings of subsidiaries	(44,809)	(47,493)	(45,353)
Common stock dividends received from subsidiaries	24,450	31,600	29,700
Depreciation of property, plant and equipment	164,150	158,725	155,607
Other amortization	17,692	16,708	16,688
Deferred income tax expense (benefit)	(851)	(33,648)	(3,191)
State refundable credit	(7,577)	(7,375)	(7,120)
Bad debt expense	5,565	4,175	1,159
Allowance for equity funds used during construction	(11,721)	(8,464)	(7,734)
Bill credits			1,400
Other	380	(65)	366
Changes in assets and liabilities
Increase in accounts receivable	(83,401)	(74,067)	(41,727)
Increase in accrued unbilled revenues	8	(43,972)	(18,345)
Decrease (increase) in fuel oil stock	45,114	(82,158)	(32,407)
Increase in materials and supplies	(16,204)	(6,124)	(3,220)
Decrease (increase) in regulatory assets	(6,616)	28,076	(15,422)
Increase (decrease) in regulatory liabilities	48,833	28,621	16,269
Increase in accounts payable	13,988	18,657	9,828
Change in prepaid and accrued income taxes, tax credits and revenue taxes	4,314	77,903	21,217
Decrease in defined benefit pension and other postretirement benefit plans liability	(5,653)	(3,545)	(3,480)
Change in other assets and liabilities	62,010	(17,884)	(36,733)
Net cash provided by operating activities	404,704	229,679	216,224
Cash flows from investing activities
Capital expenditures	(276,600)	(223,223)	(194,984)
Advances to affiliates	(70,500)	1,000	25,700
Other	4,118	(5,687)	(29,596)
Net cash used in investing activities	(342,982)	(227,910)	(198,880)
Cash flows from financing activities
Common stock dividends	(129,000)	(125,900)	(111,700)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(1,080)	(1,080)	(1,080)
Proceeds from issuance of common stock		13,101	54,400
Proceeds from issuance of long-term debt	300,000	40,000	60,000
Repayment of long-term debt	(50,000)	(40,000)
Net increase (decrease) in other bank borrowings with original maturities of three months or less		114,167	0
Repayment of short-term debt			(50,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(114,167)
Payments of obligations under finance leases	(2,728)	(670)
Other	(571)	(241)	(702)
Net cash provided by (used in) financing activities	2,454	(623)	(49,082)
Net increase (decrease) in cash, cash equivalents and restricted cash	64,176	1,146	(31,738)
Cash, cash equivalents and restricted cash, January 1	27,579	26,433	58,171
Cash, cash equivalents and restricted cash, December 31	91,755	27,579	26,433
Less: Restricted cash	(2,000)	0	(3,089)
Cash and cash equivalents	89,755	27,579	23,344
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income (loss)	29,041	22,350	21,714
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings of subsidiaries	0	0	0
Common stock dividends received from subsidiaries	0	0	0
Depreciation of property, plant and equipment	42,541	41,404	40,201
Other amortization	5,003	4,996	3,532
Deferred income tax expense (benefit)	(296)	(4,040)	(1,955)
State refundable credit	(1,782)	(1,734)	(1,672)
Bad debt expense	1,353	1,073	509
Allowance for equity funds used during construction	(1,411)	(898)	(586)
Bill credits			300
Other	(46)	(50)	(41)
Changes in assets and liabilities
Increase in accounts receivable	(7,398)	(11,644)	(6,832)
Increase in accrued unbilled revenues	(1,308)	(4,289)	(5,816)
Decrease (increase) in fuel oil stock	(1,004)	(4,150)	(4,343)
Increase in materials and supplies	(4,614)	(56)	169
Decrease (increase) in regulatory assets	5,501	1,546	24
Increase (decrease) in regulatory liabilities	(1,176)	7,977	(1,031)
Increase in accounts payable	5,998	3,294	4,723
Change in prepaid and accrued income taxes, tax credits and revenue taxes	2,407	11,117	3,861
Decrease in defined benefit pension and other postretirement benefit plans liability	(1,348)	(626)	(950)
Change in other assets and liabilities	2,056	213	(5,833)
Net cash provided by operating activities	73,517	66,483	45,974
Cash flows from investing activities
Capital expenditures	(63,889)	(49,004)	(50,516)
Advances to affiliates	4,500	(4,500)	0
Other	932	760	1,072
Net cash used in investing activities	(58,457)	(52,744)	(49,444)
Cash flows from financing activities
Common stock dividends	(13,425)	(16,400)	(14,600)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(534)	(534)	(534)
Proceeds from issuance of common stock		6,023	8,803
Proceeds from issuance of long-term debt	25,000	10,000	30,000
Repayment of long-term debt	(20,000)	(12,000)
Net increase (decrease) in other bank borrowings with original maturities of three months or less		(1,000)	(17,800)
Repayment of short-term debt			0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	0
Payments of obligations under finance leases	(400)	0
Other	(135)	(62)	(119)
Net cash provided by (used in) financing activities	(9,494)	(13,973)	5,750
Net increase (decrease) in cash, cash equivalents and restricted cash	5,566	(234)	2,280
Cash, cash equivalents and restricted cash, January 1	5,092	5,326	3,046
Cash, cash equivalents and restricted cash, December 31	10,658	5,092	5,326
Less: Restricted cash	0	0	0
Cash and cash equivalents	10,658	5,092	5,326
Maui Electric | Reportable Legal Entities | Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income (loss)	16,683	26,058	24,554
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings of subsidiaries	0	0	0
Common stock dividends received from subsidiaries	0	0	0
Depreciation of property, plant and equipment	37,014	35,295	33,661
Other amortization	3,795	3,616	1,517
Deferred income tax expense (benefit)	2,586	(3,727)	1,317
State refundable credit	(1,966)	(1,890)	(1,790)
Bad debt expense	1,243	779	515
Allowance for equity funds used during construction	(2,032)	(1,212)	(1,214)
Bill credits			300
Other	126	(24)	1,025
Changes in assets and liabilities
Increase in accounts receivable	(29,301)	(10,680)	(3,071)
Increase in accrued unbilled revenues	(1,748)	(5,762)	(3,303)
Decrease (increase) in fuel oil stock	(817)	(1,144)	(9,090)
Increase in materials and supplies	(14,047)	(1,511)	(1,482)
Decrease (increase) in regulatory assets	(9,498)	4,978	1,524
Increase (decrease) in regulatory liabilities	6,813	8,290	120
Increase in accounts payable	468	404	3,120
Change in prepaid and accrued income taxes, tax credits and revenue taxes	(4,843)	14,178	1,938
Decrease in defined benefit pension and other postretirement benefit plans liability	(1,185)	(657)	(724)
Change in other assets and liabilities	17,305	(3,623)	(8,196)
Net cash provided by operating activities	20,596	63,368	40,721
Cash flows from investing activities
Capital expenditures	(98,286)	(57,230)	(46,500)
Advances to affiliates	21,700	(21,700)	0
Other	1,126	1,253	1,073
Net cash used in investing activities	(75,460)	(77,677)	(45,427)
Cash flows from financing activities
Common stock dividends	(11,025)	(15,200)	(15,100)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(381)	(381)	(381)
Proceeds from issuance of common stock		3,023	24,597
Proceeds from issuance of long-term debt	25,000	10,000	25,000
Repayment of long-term debt	(30,000)	0
Net increase (decrease) in other bank borrowings with original maturities of three months or less		0	(7,900)
Repayment of short-term debt			0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	70,500
Payments of obligations under finance leases	0	0
Other	(137)	(61)	(120)
Net cash provided by (used in) financing activities	53,957	(2,619)	26,096
Net increase (decrease) in cash, cash equivalents and restricted cash	(907)	(16,928)	21,390
Cash, cash equivalents and restricted cash, January 1	6,494	23,422	2,032
Cash, cash equivalents and restricted cash, December 31	5,587	6,494	23,422
Less: Restricted cash	0	0	0
Cash and cash equivalents	5,587	6,494	23,422
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income (loss)	0	0	0
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings of subsidiaries	0	0	0
Common stock dividends received from subsidiaries	0	0	0
Depreciation of property, plant and equipment	0	0	0
Other amortization	0	0	0
Deferred income tax expense (benefit)	0	0	0
State refundable credit	0	0	0
Bad debt expense	0	0	0
Allowance for equity funds used during construction	0	0	0
Bill credits			0
Other	0	0	0
Changes in assets and liabilities
Increase in accounts receivable	0	0	0
Increase in accrued unbilled revenues	0	0	0
Decrease (increase) in fuel oil stock	0	0	0
Increase in materials and supplies	0	0	0
Decrease (increase) in regulatory assets	0	0	0
Increase (decrease) in regulatory liabilities	0		0
Increase in accounts payable	0	0	0
Change in prepaid and accrued income taxes, tax credits and revenue taxes	0	0	0
Decrease in defined benefit pension and other postretirement benefit plans liability	0	0	0
Change in other assets and liabilities	0	0	0
Net cash provided by operating activities	0	0	0
Cash flows from investing activities
Capital expenditures	0	0	0
Advances to affiliates	0	0	0
Other	0	0	0
Net cash used in investing activities	0	0	0
Cash flows from financing activities
Common stock dividends	0	0	0
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0	0
Proceeds from issuance of common stock		0	0
Proceeds from issuance of long-term debt	0	0	0
Repayment of long-term debt	0	0
Net increase (decrease) in other bank borrowings with original maturities of three months or less		0	0
Repayment of short-term debt			0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	0
Payments of obligations under finance leases	0	0
Other	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	0	0	0
Cash, cash equivalents and restricted cash, January 1	77	77	77
Cash, cash equivalents and restricted cash, December 31	77	77	77
Less: Restricted cash	0	0	0
Cash and cash equivalents	$ 77	$ 77	$ 77

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