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Long-term debt - Changes in Long-Term Debt (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2019
Jul. 26, 2019
May 15, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 10, 2019
Jul. 18, 2019
May 13, 2019
Debt Instrument [Line Items]                    
Repayments of long-term debt         $ 287,285,000 $ 53,887,000 $ 465,000,000      
Hawaiian Electric Company, Inc. and Subsidiaries                    
Debt Instrument [Line Items]                    
Long-term debt $ 1,505,000,000       1,505,000,000 1,426,546,000        
Repayments of long-term debt         283,546,000 50,000,000 $ 265,000,000      
Repayments of long-term debt including interest 84,000,000                  
Interest paid 2,000,000                  
Hawaiian Electric                    
Debt Instrument [Line Items]                    
Repayments of long-term debt 62,000,000                  
Maui Electric                    
Debt Instrument [Line Items]                    
Repayments of long-term debt 20,000,000                  
Unsecured Debt | Hawaiian Electric Company, Inc. and Subsidiaries                    
Debt Instrument [Line Items]                    
Long-term debt 963,000,000       $ 963,000,000 964,546,000        
Unsecured Debt | Mauo Unsecured Loan Due 2022                    
Debt Instrument [Line Items]                    
Debt instrument, face amount       $ 50,500,000            
Line of credit facility basis point spread         1.375%          
Long-term debt 9,349,000       $ 9,349,000 $ 0        
Unsecured Debt | Mauo Unsecured Loan Due 2022 | LIBOR                    
Debt Instrument [Line Items]                    
Line of credit facility basis point spread       1.375%            
Unsecured Debt | Series 2019A | Hawaiian Electric Company, Inc. and Subsidiaries                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                   $ 50,000,000
Debt instrument, stated interest rate                   4.21%
Unsecured Debt | Series 2019A | Hawaiian Electric                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                   $ 30,000,000
Unsecured Debt | Series 2019A | Hawaii Electric Light                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                   10,000,000
Unsecured Debt | Series 2019A | Maui Electric                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                   $ 10,000,000
Unsecured Debt | 2004 Junior subordinated deferrable interest debentures redeemed | Hawaiian Electric Company, Inc. and Subsidiaries                    
Debt Instrument [Line Items]                    
Debt instrument, stated interest rate     6.50%              
Extinguishment of debt amount     $ 51,500,000              
Unsecured Debt | 2004 Junior subordinated deferrable interest debentures redeemed | Hawaiian Electric                    
Debt Instrument [Line Items]                    
Extinguishment of debt amount     31,500,000              
Unsecured Debt | 2004 Junior subordinated deferrable interest debentures redeemed | Hawaii Electric Light                    
Debt Instrument [Line Items]                    
Extinguishment of debt amount     10,000,000              
Unsecured Debt | 2004 Junior subordinated deferrable interest debentures redeemed | Maui Electric                    
Debt Instrument [Line Items]                    
Extinguishment of debt amount     $ 10,000,000              
Unsecured Debt | Refunding Series 2019 Special Purpose Revenue Bonds | Hawaiian Electric Company, Inc. and Subsidiaries                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                 $ 150,000,000  
Debt instrument, stated interest rate                 3.20%  
Unsecured Debt | Refunding Series 2019 Special Purpose Revenue Bonds | Hawaiian Electric                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                 $ 90,000,000  
Unsecured Debt | Refunding Series 2019 Special Purpose Revenue Bonds | Hawaii Electric Light                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                 $ 60,000,000  
Unsecured Debt | Series 2009 Special Purpose Revenue Bonds Redeemed | Hawaiian Electric Company, Inc. and Subsidiaries                    
Debt Instrument [Line Items]                    
Debt instrument, stated interest rate   6.50%                
Extinguishment of debt amount   $ 150,000,000                
Unsecured Debt | Series 2009 Special Purpose Revenue Bonds Redeemed | Hawaiian Electric                    
Debt Instrument [Line Items]                    
Extinguishment of debt amount   90,000,000                
Unsecured Debt | Series 2009 Special Purpose Revenue Bonds Redeemed | Hawaii Electric Light                    
Debt Instrument [Line Items]                    
Extinguishment of debt amount   $ 60,000,000                
Unsecured Debt | Series 2019 Special Purpose Revenue Bonds | Hawaiian Electric Company, Inc. and Subsidiaries                    
Debt Instrument [Line Items]                    
Debt instrument, face amount               $ 80,000,000    
Debt instrument, stated interest rate               3.50%    
Unsecured Debt | Series 2019 Special Purpose Revenue Bonds | Hawaiian Electric                    
Debt Instrument [Line Items]                    
Debt instrument, face amount               $ 70,000,000    
Undrawn funds sitting with trustee 30,800,000       30,800,000          
Unsecured Debt | Series 2019 Special Purpose Revenue Bonds | Hawaii Electric Light                    
Debt Instrument [Line Items]                    
Debt instrument, face amount               2,500,000    
Undrawn funds sitting with trustee 100,000       100,000          
Unsecured Debt | Series 2019 Special Purpose Revenue Bonds | Maui Electric                    
Debt Instrument [Line Items]                    
Debt instrument, face amount               $ 7,500,000    
Undrawn funds sitting with trustee $ 0       $ 0