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Electric utility segment - Consolidating Statement of Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Statement of Income Captions [Line Items]      
Net income for common stock $ 199,238 $ 241,138 $ 246,166
Retirement benefit plans:      
Net gains (losses) arising during the period, net of (taxes) benefits 10,854 188,020 153,121
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (1,560) 19,659 19,253
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits (8,204) (199,936) (171,345)
Other comprehensive income (loss), net of taxes 46,678 (283,495) (51,269)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 245,916 (42,357) 194,897
Hawaiian Electric Company, Inc. and Subsidiaries      
Condensed Statement of Income Captions [Line Items]      
Net income for common stock 193,952 188,929 177,642
Retirement benefit plans:      
Net gains (losses) arising during the period, net of (taxes) benefits 10,175 187,193 151,523
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (1,983) 18,884 19,461
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits (8,204) (199,936) (171,345)
Other comprehensive income (loss), net of taxes (12) 6,141 (361)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 193,940 195,070 177,281
Consolidating adjustments | Hawaiian Electric Company, Inc. and Subsidiaries      
Condensed Statement of Income Captions [Line Items]      
Net income for common stock (44,809) (47,493) (45,353)
Retirement benefit plans:      
Net gains (losses) arising during the period, net of (taxes) benefits (2,236) (88,797) (34,474)
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes 487 (5,395) (5,302)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits 1,730 93,535 39,483
Other comprehensive income (loss), net of taxes (19) (657) (293)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (44,828) (48,150) (45,646)
Hawaiian Electric      
Condensed Statement of Income Captions [Line Items]      
Net income for common stock 199,238 241,138 246,166
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Company, Inc. and Subsidiaries      
Condensed Statement of Income Captions [Line Items]      
Net income for common stock 193,952 188,929 177,642
Retirement benefit plans:      
Net gains (losses) arising during the period, net of (taxes) benefits 10,175 187,193 151,523
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (1,983) 18,884 19,461
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits (8,204) (199,936) (171,345)
Other comprehensive income (loss), net of taxes (12) 6,141 (361)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 193,940 195,070 177,281
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Company, Inc. and Subsidiaries      
Condensed Statement of Income Captions [Line Items]      
Net income for common stock 28,507 21,816 21,180
Retirement benefit plans:      
Net gains (losses) arising during the period, net of (taxes) benefits 961 44,411 17,902
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (221) 2,811 2,749
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits (752) (46,841) (20,585)
Other comprehensive income (loss), net of taxes (12) 381 66
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 28,495 22,197 21,246
Maui Electric | Reportable Legal Entities | Hawaiian Electric Company, Inc. and Subsidiaries      
Condensed Statement of Income Captions [Line Items]      
Net income for common stock 16,302 25,677 24,173
Retirement benefit plans:      
Net gains (losses) arising during the period, net of (taxes) benefits 1,275 44,386 16,572
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes (266) 2,584 2,553
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits (978) (46,694) (18,898)
Other comprehensive income (loss), net of taxes 31 276 227
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 16,333 $ 25,953 $ 24,400