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Electric utility segment - Unconsolidated variable interest entities (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2015
MW
Oct. 31, 2015
MW
Oct. 31, 2004
MW
Mar. 31, 2004
USD ($)
security
Oct. 31, 1988
MW
Mar. 31, 1988
MW
Sep. 30, 2016
USD ($)
entity
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
agreement
entity
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Power purchase agreement                      
Purchases from IPPs             $ 158,000,000 $ 161,000,000 $ 413,000,000 $ 446,000,000  
Termination period                 60 days    
Accounts payable             $ 134,176,000   $ 134,176,000   $ 138,523,000
Hawaiian Electric Company                      
Power purchase agreement                      
Number of power purchase agreements (PPAs) | agreement                 5    
Number of entities currently not required to be consolidated as VIEs | entity             0   0    
Purchases from IPPs             $ 118,751,000 119,302,000 $ 313,730,000 329,922,000  
Number of firm capacity producers declining to provide financial information to determine primary beneficiary status | entity                 2    
Minimum potential number of IPP entities consolidated into company in the future | entity                 1    
Hawaiian Electric Company | AES Hawaii, Inc. (AES Hawaii)                      
Power purchase agreement                      
Purchases from IPPs             38,000,000 37,000,000 $ 112,000,000 97,000,000  
Power purchase capacity that Increases from initial capacity (in megawatts) | MW 189         180          
Number of years entity entered under power purchase agreement           30 years          
Accounts payable             13,000,000   13,000,000    
Hawaiian Electric Company | Kalaeloa Partners, L.P. (Kalaeloa)                      
Power purchase agreement                      
Purchases from IPPs             44,000,000 51,000,000 109,000,000 143,000,000  
Power purchase capacity that Increases from initial capacity (in megawatts) | MW         180            
Number of years entity entered under power purchase agreement         25 years            
Power purchase capacity that Increases from initial capacity (in megawatts) | MW     208                
Accounts payable             12,000,000   12,000,000    
Hawaiian Electric Company | Hamakua Energy Partners, L.P. (HEP)                      
Power purchase agreement                      
Purchases from IPPs             8,000,000 13,000,000 23,000,000 34,000,000  
Hawaiian Electric Company | HPOWER                      
Power purchase agreement                      
Purchases from IPPs             19,000,000 18,000,000 52,000,000 50,000,000  
Hawaiian Electric Company | Puna Geothermal Venture                      
Power purchase agreement                      
Purchases from IPPs             7,000,000 8,000,000 19,000,000 22,000,000  
Hawaiian Electric Company | Hawaiian Commercial & Sugar (HC&S)                      
Power purchase agreement                      
Purchases from IPPs             1,000,000 2,000,000 1,000,000 7,000,000  
Hawaiian Electric Company | Other IPPs                      
Power purchase agreement                      
Purchases from IPPs             41,000,000 32,000,000 97,000,000 93,000,000  
Hawaii Electric Light Company, Inc. (HELCO)                      
Power purchase agreement                      
Purchases from IPPs             22,728,000 26,713,000 58,885,000 73,161,000  
Maui Electric                      
Power purchase agreement                      
Purchases from IPPs             16,271,000 $ 14,503,000 40,052,000 42,726,000  
Maximum scheduled energy during certain month (in megawatts) | MW   4                  
Maximum potential emergency power | MW   16                  
HECO Capital Trust III                      
Unconsolidated variable interest entities                      
Investment in 2004 Debentures             51,500,000   51,500,000   51,500,000
Interest income                 $ 2,500,000 2,500,000  
HECO Capital Trust III | Hawaiian Electric Company                      
Unconsolidated variable interest entities                      
Principal amount of 2004 Debentures       $ 31,500,000              
Percent of ownership in Trust III                 100.00%    
HECO Capital Trust III | Hawaiian Electric Company | 2004 Trust Preferred Securities                      
Unconsolidated variable interest entities                      
Number of 2004 Trust Preferred Securities issued | security       2,000,000              
Dividend rate on 2004 Trust Preferred Securities (as a percent)       6.50%              
Aggregate Liquidation preference       $ 50,000,000              
Balance of Trust Securities             50,000,000   $ 50,000,000   50,000,000
Dividend distributions on Trust Preferred Securities                 2,400,000 2,400,000  
HECO Capital Trust III | Hawaiian Electric Company | Trust Common Securities                      
Unconsolidated variable interest entities                      
Aggregate Liquidation preference       1,500,000              
Balance of Trust Securities             $ 1,500,000   1,500,000   $ 1,500,000
Common dividend                 $ 75,000 $ 75,000  
HECO Capital Trust III | Hawaii Electric Light Company, Inc. (HELCO)                      
Unconsolidated variable interest entities                      
Principal amount of 2004 Debentures       10,000,000              
HECO Capital Trust III | Maui Electric                      
Unconsolidated variable interest entities                      
Principal amount of 2004 Debentures       $ 10,000,000