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Electric utility segment - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Condensed Statement of Income Captions [Line Items]                
Net income (loss) for common stock $ 41,118 $ 54,610 $ 54,721 $ 62,082 $ 52,541 $ 69,167 $ 150,449 $ 183,790
Retirement benefit plans:                
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (446)     5,606     (1,160) 10,229
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 470     (5,303)     1,321 (9,572)
Other comprehensive income (loss), net of taxes (34,875) (7,609) 20,488 (96,012) (87,840) (117,159) (21,996) (301,011)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 6,243     (33,930)     128,453 (117,221)
Hawaiian Electric Consolidated                
Condensed Statement of Income Captions [Line Items]                
Net income (loss) for common stock 43,461 45,299 47,009 49,764 44,135 46,409 135,769 140,308
Retirement benefit plans:                
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (547)     5,411     (1,487) 9,782
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 470     (5,303)     1,321 (9,572)
Other comprehensive income (loss), net of taxes (77) $ (44) $ (45) 108 $ 51 $ 51 (166) 210
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 43,384     49,872     135,603 140,518
Consolidating adjustments | Hawaiian Electric Consolidated                
Condensed Statement of Income Captions [Line Items]                
Net income (loss) for common stock (3,005)     (10,577)     (25,960) (36,475)
Retirement benefit plans:                
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes 126     (1,500)     366 (3,304)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (117)     1,499     (334) 3,300
Other comprehensive income (loss), net of taxes 9     (1)     32 (4)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. (2,996)     (10,578)     (25,928) (36,479)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated                
Condensed Statement of Income Captions [Line Items]                
Net income (loss) for common stock 43,461     49,764     135,769 140,308
Retirement benefit plans:                
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (547)     5,411     (1,487) 9,782
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 470     (5,303)     1,321 (9,572)
Other comprehensive income (loss), net of taxes (77)     108     (166) 210
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 43,384     49,872     135,603 140,518
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated                
Condensed Statement of Income Captions [Line Items]                
Net income (loss) for common stock 7,419     4,959     20,884 17,994
Retirement benefit plans:                
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (55)     768     (166) 1,366
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 54     (766)     157 (1,362)
Other comprehensive income (loss), net of taxes (1)     2     (9) 4
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 7,418     4,961     20,875 17,998
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated                
Condensed Statement of Income Captions [Line Items]                
Net income (loss) for common stock (4,414)     5,618     5,076 18,481
Retirement benefit plans:                
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (71)     732     (200) 1,938
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 63     (733)     177 (1,938)
Other comprehensive income (loss), net of taxes (8)     (1)     (23) 0
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. (4,422)     5,617     5,053 18,481
Other subsidiary | Reportable Legal Entities | Hawaiian Electric Consolidated                
Condensed Statement of Income Captions [Line Items]                
Net income (loss) for common stock 0     0     0 0
Retirement benefit plans:                
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes 0     0     0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 0     0     0
Other comprehensive income (loss), net of taxes 0     0     0 0
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. $ 0     $ 0     $ 0 $ 0