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Bank segment (HEI only) - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 1988
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Revenues $ 3,682,166 $ 3,741,985 $ 2,850,379  
Bank        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Revenues 394,663 321,068 306,398  
American Savings Bank (ASB) | Related Party | Bank        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Revenues 2,300 1,900 2,100  
Hawaiian Electric        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Cash dividends paid 168,000 168,000 172,000  
Revenues 268 320 105  
Hawaiian Electric | Maximum        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Obligation to contribute additional capital under the Capital Maintenance Agreement       $ 65,100
Reduction in obligation to contribute additional capital under the capital maintenance agreement 28,300      
American Savings Bank (ASB)        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Cash dividends paid 39,000 42,000    
Revenues $ 394,663 $ 321,068 $ 306,398