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Unconsolidated variable interest entities (Details) - HECO (USD $)
 1 Months Ended 3 Months Ended
Mar. 31, 2004
security
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
        
Power purchase agreement        
Number of power purchase agreements (PPAs)   6    
Power purchase capacity excluding agreements with smaller IPPs (in megawatts)   548    
Maximum capacity of small power production facilities (in kilowatts)   100    
Percentage of power purchase from AES Hawaii, Inc. (AES Hawaii), Kalaeloa Partners, L.P. (Kalaeloa), Hamakua Energy Partners, L.P. (HEP) and HPOWER   90.00%    
Purchases from IPPs   $ 165,000,000 $ 148,000,000  
Hawaiian Electric Company, Inc. and Subsidiaries | AES Hawaii, Inc. (AES Hawaii)
        
Power purchase agreement        
Purchases from IPPs   35,000,000 35,000,000  
Hawaiian Electric Company, Inc. and Subsidiaries | Kalaeloa Partners, L.P. (Kalaeloa)
        
Power purchase agreement        
Purchases from IPPs   69,000,000 62,000,000  
Hawaiian Electric Company, Inc. and Subsidiaries | Hamakua Energy Partners, L.P. (HEP)
        
Power purchase agreement        
Purchases from IPPs   14,000,000 14,000,000  
Hawaiian Electric Company, Inc. and Subsidiaries | HPOWER
        
Power purchase agreement        
Purchases from IPPs   16,000,000 13,000,000  
HECO Capital Trust III
        
Unconsolidated variable interest entities        
Investment in 2004 Debentures   51,500,000   51,500,000
Interest income   800,000 800,000  
HECO Capital Trust III | Hawaiian Electric Company, Inc. and Subsidiaries
        
Unconsolidated variable interest entities        
Principal amount of 2004 Debentures 31,500,000      
HECO Capital Trust III | Hawaiian Electric Company, Inc. and Subsidiaries | 2004 Trust Preferred Securities
        
Unconsolidated variable interest entities        
Number of 2004 Trust Preferred Securities issued 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
Dividend distributions on Trust Preferred Securities   800,000 800,000  
HECO Capital Trust III | Hawaiian Electric Company, Inc. and Subsidiaries | Trust Common Securities
        
Unconsolidated variable interest entities        
Aggregate Liquidation preference 1,500,000      
Balance of Trust Securities   1,500,000   1,500,000
Common dividend   25,000 25,000  
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 Company, Limited (MECO)
        
Unconsolidated variable interest entities        
Principal amount of 2004 Debentures $ 10,000,000