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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reclassifications out of accumulated other comprehensive income/(loss)    
Revenues $ (897,158) $ (928,237)
Interest expense 31,591 28,798
Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications 3,048 3,697
Hawaiian Electric Company, Inc. and Subsidiaries    
Reclassifications out of accumulated other comprehensive income/(loss)    
Revenues (788,578) (830,361)
Total reclassifications (39,720) (47,508)
Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications (49) (45)
Amortization of unrealized holding losses on held-to-maturity securities | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Revenues 3,086 3,677
Net realized gains on derivatives qualifying as cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Interest expense (48) (48)
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications (449) (357)
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications (508) (470)
Impact of D&Os of the PUC included in regulatory assets | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications 459 425
Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications $ 459 $ 425