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Regulatory restrictions on net assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Regulatory restrictions on net assets        
Common stock equity $ 2,344,841 $ 2,202,499 $ 2,390,884 $ 2,337,502
Hawaiian Electric Company, Inc. and Subsidiaries        
Regulatory restrictions on net assets        
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances $ 1,200,000      
Hawaiian Electric Company, Inc. and Subsidiaries        
Regulatory restrictions on net assets        
Total capitalization, percentage 35.00%      
Distribution restrictions, percent of earnings in current year and 5 preceding years if capitalization rate is less than 35% 80.00%      
Total capitalization rate of HEI's electric utility subsidiaries 51.00%      
Common stock equity $ 2,409,110 2,344,170 $ 2,261,899 $ 2,141,918
American Savings Bank (ASB)        
Regulatory restrictions on net assets        
Common stock equity 529,851 $ 468,885    
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances $ 210,000