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Electric utility segment - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Condensed Statement of Income Captions [Line Items]            
Net income (loss) for common stock $ 26,085   $ (1,295,484)   $ 52,756 $ (1,253,362)
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (508)   (445)   (1,013) (894)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 484   459   967 918
Other comprehensive income (loss), net of taxes (306) $ (460) 1,594 $ (9,801) (766) (8,207)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 25,779   (1,293,890)   51,990 (1,261,569)
Hawaiian Electric Consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income (loss) for common stock 39,150   (1,229,394)   86,966 (1,190,173)
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (531)   (505)   (1,061) (1,013)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 484   459   967 918
Other comprehensive income (loss), net of taxes (47) $ (47) (46) $ (49) (94) (95)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 39,103   (1,229,440)   86,872 (1,190,268)
Consolidating adjustments | Hawaiian Electric Consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income (loss) for common stock (7,767)   246,099   (17,492) 240,075
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes 88   96   182 193
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (75)   (85)   (151) (169)
Other comprehensive income (loss), net of taxes 13   11   31 24
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. (7,754)   246,110   (17,461) 240,099
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income (loss) for common stock 39,150   (1,229,394)   86,966 (1,190,173)
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (531)   (505)   (1,061) (1,013)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 484   459   967 918
Other comprehensive income (loss), net of taxes (47)   (46)   (94) (95)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 39,103   (1,229,440)   86,872 (1,190,268)
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income (loss) for common stock 5,700   (120,295)   9,296 (115,905)
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (26)   (39)   (55) (77)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 22   35   44 70
Other comprehensive income (loss), net of taxes (4)   (4)   (11) (7)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 5,696   (120,299)   9,285 (115,912)
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income (loss) for common stock 1,101   (125,804)   5,537 (124,170)
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (62)   (57)   (127) (116)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 53   50   107 99
Other comprehensive income (loss), net of taxes (9)   (7)   (20) (17)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 1,092   (125,811)   5,517 (124,187)
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income (loss) for common stock 966   0   2,659 0
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes 0   0   0 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 0   0   0 0
Other comprehensive income (loss), net of taxes 0   0   0 0
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. $ 966   $ 0   $ 2,659 $ 0