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Electric utility segment - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Condensed Statement of Income Captions [Line Items]    
Net income for common stock $ 42,122 $ 54,721
Retirement benefit plans:    
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 459 425
Other comprehensive loss, net of taxes (9,801) 20,488
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 32,321 75,209
Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 39,221 47,009
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (508) (470)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 459 425
Other comprehensive loss, net of taxes (49) (45)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 39,172 46,964
Consolidating adjustments | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock (6,024) (11,541)
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes 97 119
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (84) (107)
Other comprehensive loss, net of taxes 13 12
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (6,011) (11,529)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 39,221 47,009
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (508) (470)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 459 425
Other comprehensive loss, net of taxes (49) (45)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 39,172 46,964
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 4,390 6,390
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (38) (56)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 35 50
Other comprehensive loss, net of taxes (3) (6)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 4,387 6,384
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 1,634 5,151
Retirement benefit plans:    
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (59) (63)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 49 57
Other comprehensive loss, net of taxes (10) (6)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 1,624 5,145
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 0 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 taxes 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 0 $ 0