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Credit agreements, long-term debt and changes in long-term debt - Narrative (Details)
 6 Months Ended
Apr. 09, 2025
USD ($)
May 17, 2024
USD ($)
extensionOption
May 14, 2023
USD ($)
institution
extensionOption
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 30, 2024
USD ($)
Dec. 06, 2024
USD ($)
Jun. 27, 2024
USD ($)
Credit agreement                  
Short-term borrowings from non-affiliates, net       $ 49,312,000   $ 48,623,000      
Aggregate principal amount, redeemed       630,808,000 $ 9,888,000        
Revolving Credit Facility                  
Credit agreement                  
Credit agreement       650,000,000   664,000,000      
Credit agreement, remaining borrowing capacity       506,000,000   275,000,000      
Hawaiian Electric Company, Inc. and Subsidiaries                  
Credit agreement                  
Aggregate principal amount, redeemed       123,000,000 $ 0        
Hawaiian Electric Company, Inc. and Subsidiaries | Revolving Credit Facility                  
Credit agreement                  
Credit agreement       550,000,000   564,000,000      
Credit agreement, remaining borrowing capacity       457,000,000   348,000,000      
Hawaiian Electric Company, Inc. and Subsidiaries | Term Loan                  
Credit agreement                  
Short-term borrowings from non-affiliates, net             $ 50,000,000    
Debt instrument, face amount             $ 50,000,000    
Stated interest rate (as percent)             7.50%    
Hawaiian Electric Facility                  
Credit agreement                  
Credit agreement     $ 200,000,000            
Credit agreement, remaining borrowing capacity     $ 180,000,000            
Hawaiian Electric Facility | Hawaiian Electric Company, Inc. and Subsidiaries                  
Credit agreement                  
Number of extension options | extensionOption     2            
Extension period     1 year            
Hawaiian Electric Facility | Hawaiian Electric Company, Inc. and Subsidiaries | Letter of Credit                  
Credit agreement                  
Credit agreement               $ 75,000,000  
Credit Facilities | Hawaiian Electric Company, Inc. and Subsidiaries                  
Credit agreement                  
Number of financial institutions with extended termination date | institution     8            
Number of financial institutions | institution     9            
HEI Facility                  
Credit agreement                  
Credit agreement     $ 175,000,000            
Credit agreement, remaining borrowing capacity     $ 157,000,000            
ABL Credit Facility Agreement | Hawaiian Electric Company, Inc. and Subsidiaries | Revolving Credit Facility                  
Credit agreement                  
Credit agreement       225,000,000   239,000,000      
Credit agreement, remaining borrowing capacity       225,000,000   $ 239,000,000      
ABL Credit Facility Agreement | Hawaiian Electric Company, Inc. and Subsidiaries | Revolving Credit Facility | Line of credit facility                  
Credit agreement                  
Number of extension options | extensionOption   3              
Extension period   1 year              
Credit agreement   $ 250,000,000              
Credit agreement, remaining borrowing capacity       $ 225,000,000          
Credit facility period   364 days              
Automatic extension expiration period   3 years              
Short-term borrowings from non-affiliates, net                 $ 250,000,000
HEI Private Placement                  
Credit agreement                  
Aggregate principal amount, redeemed $ 384,000,000                
Interest accrued $ 5,000,000