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Unconsolidated variable interest entities (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
entity
agreement
Dec. 31, 2012
Dec. 31, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Dec. 31, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Dec. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
Dec. 31, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
AES Hawaii, Inc. (AES Hawaii)
Dec. 31, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
AES Hawaii, Inc. (AES Hawaii)
Dec. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
AES Hawaii, Inc. (AES Hawaii)
Dec. 31, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Kalaeloa Partners, L.P. (Kalaeloa)
Dec. 31, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Kalaeloa Partners, L.P. (Kalaeloa)
Dec. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
Kalaeloa Partners, L.P. (Kalaeloa)
Dec. 31, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Hamakua Energy Partners, L.P. (HEP)
Dec. 31, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Hamakua Energy Partners, L.P. (HEP)
Dec. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
Hamakua Energy Partners, L.P. (HEP)
Dec. 31, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
HPOWER
Dec. 31, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
HPOWER
Dec. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
HPOWER
Dec. 31, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Other Independent Power Producers [Member]
Dec. 31, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Other Independent Power Producers [Member]
Dec. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
Other Independent Power Producers [Member]
Dec. 31, 2013
HECO
agreement
entity
kW
Dec. 31, 2012
HECO
Dec. 31, 2011
HECO
Dec. 31, 2013
HECO
Kalaeloa Partners, L.P. (Kalaeloa)
MW
Dec. 31, 2013
Hawaii Electric Light Company, Inc. (HELCO)
Dec. 31, 2012
Hawaii Electric Light Company, Inc. (HELCO)
Dec. 31, 2011
Hawaii Electric Light Company, Inc. (HELCO)
Dec. 31, 2013
Maui Electric Company, Limited (MECO)
Dec. 31, 2012
Maui Electric Company, Limited (MECO)
Dec. 31, 2011
Maui Electric Company, Limited (MECO)
Dec. 31, 2013
HECO Capital Trust III
Mar. 31, 2004
HECO Capital Trust III
HECO
Mar. 31, 2004
HECO Capital Trust III
HECO
2004 Trust Preferred Securities
security
Dec. 31, 2013
HECO Capital Trust III
HECO
2004 Trust Preferred Securities
Dec. 31, 2013
HECO Capital Trust III
HECO
Trust Common Securities
Mar. 31, 2004
HECO Capital Trust III
HECO
Trust Common Securities
Mar. 31, 2004
HECO Capital Trust III
Hawaii Electric Light Company, Inc. (HELCO)
Mar. 31, 2004
HECO Capital Trust III
Maui Electric Company, Limited (MECO)
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     $ 1,500,000.0    
Principal amount of 2004 Debentures                                                               31,500,000.0         10,000,000 10,000,000
Investment in 2004 Debentures                                                             51,500,000              
Balance of Trust Securities                                                                   50,000,000 1,500,000      
Interest income                                                             3,400,000              
Dividend distributions on Trust Preferred Securities                                                                   3,300,000        
Common dividend                                                                     100,000      
Power purchase agreement                                                                            
Number of power purchase agreements (PPAs) 6                                       6                                  
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     710,681,000 724,240,000 689,652,000 134,000,000 146,000,000 133,000,000 301,000,000 310,000,000 310,000,000 51,000,000 65,000,000 59,000,000 61,000,000 65,000,000 62,000,000 164,000,000 138,000,000 126,000,000 527,839,000 540,802,000 522,503,000   128,368,000 145,386,000 137,453,000 54,474,000 38,052,000 29,696,000                
Number of largest IPP's declining to provide financial information to determine primary beneficiary status 3                                                                          
Number of entities owning wind farms not required to be consolidated as VIE's                                         2                                  
Minimum potential number of IPP entities consolidated into company in the future                                         1                                  
Power purchase capacity (in megawatts)                                               180                            
Number of years entity entered under power purchase agreement                                               25 years                            
Power purchase capacity that Increases from initial capacity (in megawatts)                                               208                            
Accounts payable $ 212,331,000 $ 212,379,000                                           $ 23,000,000