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Electric utility segment - Condensed consolidating statement of comprehensive income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Condensed Statement of Income Captions [Line Items]    
Net income for common stock $ 54,721 $ 69,167
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 (357) 4,501
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 425 (4,325)
Other comprehensive income (loss), net of taxes 20,488 (117,159)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 75,209 (47,992)
Hawaiian Electric Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 47,009 46,409
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 (470) 4,376
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 425 (4,325)
Other comprehensive income (loss), net of taxes (45) 51
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 46,964 46,460
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric (parent only)    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 47,009 46,409
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 (470) 4,376
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 425 (4,325)
Other comprehensive income (loss), net of taxes (45) 51
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 46,964 46,460
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 6,390 7,377
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 (56) 670
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 50 (670)
Other comprehensive income (loss), net of taxes (6) 0
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 6,384 7,377
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 5,151 6,284
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 (63) 603
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 57 (603)
Other comprehensive income (loss), net of taxes (6) 0
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 5,145 6,284
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 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
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 0 0
Other comprehensive income (loss), net of taxes 0 0
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 0 0
Hawaiian Electric Consolidated | Consolidating adjustments    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock (11,541) (13,661)
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 119 (1,273)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (107) 1,273
Other comprehensive income (loss), net of taxes 12 0
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. $ (11,529) $ (13,661)