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Electric utility segment - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Condensed Statement of Income Captions [Line Items]    
Net income for common stock $ 26,671 $ 42,122
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (505) (449)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 483 459
Other comprehensive loss, net of tax benefits (460) (9,801)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 26,211 32,321
Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 47,816 39,221
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (530) (508)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 483 459
Other comprehensive loss, net of tax benefits (47) (49)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 47,769 39,172
Consolidating adjustments | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock (9,725) (6,024)
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes 94 97
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (76) (84)
Other comprehensive loss, net of tax benefits 18 13
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (9,707) (6,011)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 47,816 39,221
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (530) (508)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 483 459
Other comprehensive loss, net of tax benefits (47) (49)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 47,769 39,172
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 3,596 4,390
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (29) (38)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 22 35
Other comprehensive loss, net of tax benefits (7) (3)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 3,589 4,387
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 4,436 1,634
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (65) (59)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 54 49
Other comprehensive loss, net of tax benefits (11) (10)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 4,425 1,624
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 1,693 0
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes 0 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 0 0
Other comprehensive loss, net of tax benefits 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 1,693 $ 0