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Commitments and contingencies (Details) - HECO (USD $)
 9 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 0 Months Ended
Sep. 30, 2013
item
May 31, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Oct. 19, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Jun. 30, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
item
Apr. 30, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
item
Nov. 30, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
Sep. 30, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Sep. 30, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Sep. 30, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
kW
Sep. 30, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Sep. 30, 2013
Maui Electric Company, Limited (MECO)
Sep. 30, 2012
Maui Electric Company, Limited (MECO)
Sep. 30, 2013
Maui Electric Company, Limited (MECO)
Sep. 30, 2012
Maui Electric Company, Limited (MECO)
Mar. 31, 2012
Maui Electric Company, Limited (MECO)
Jan. 28, 2013
Hawaii Electric Light Company, Inc. (HELCO)
Sep. 30, 2013
Hawaii Electric Light Company, Inc. (HELCO)
Sep. 30, 2012
Hawaii Electric Light Company, Inc. (HELCO)
Sep. 30, 2013
Hawaii Electric Light Company, Inc. (HELCO)
Sep. 30, 2012
Hawaii Electric Light Company, Inc. (HELCO)
Sep. 30, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Sep. 30, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Sep. 30, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Sep. 30, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
Dec. 31, 2012
East Oahu transmission project
Hawaiian Electric Company, Inc. and Subsidiaries
Dec. 31, 2012
Customer Information System Project
Maui Electric Company, Limited (MECO)
Dec. 31, 2012
Customer Information System Project
Hawaii Electric Light Company, Inc. (HELCO)
Dec. 31, 2012
Customer Information System Project
Group of subsidiaries
Jan. 28, 2013
Customer Information System Project
Group of subsidiaries
Dec. 31, 2012
CIP CT-1 and CIS projects
Group of subsidiaries
Nov. 07, 2013
Subsequent Event
Hawaiian Electric Company, Inc. and Subsidiaries
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Regulatory projects and legal obligations                                                              
Project costs to be written off, subject to approval by PUC                                                         $ 40,000,000    
After-tax charge to net income due to write-off of project costs                                                 17,100,000 3,200,000 3,400,000 24,000,000      
Remaining recoverable project costs included in rate base, in accordance with the settlement agreement                                                           52,000,000  
Term of cycle, within which rate case can not be filed                               3 years                              
Percentage of renewable energy as per State's Renewable Portfolio Standard (RPS), which is committed to be achieved                 40.00%                           40.00%                
Deferred cost to be recovered subject to PUC approval         3,900,000                                                    
Period for deferred cost recovery         3 years                                                    
Accrual rate of carrying cost per annum (as a percent)         1.75%                                                    
Deferred cost to be recovered for additional studies subject to PUC approval           555,000,000                                                  
Integration from renewable energy sources (in kilowatts)                 200,000                           200,000                
Maximum deferred cost recovery                 5,890,000                                            
Integration from firm renewable geothermal dispatchable energy (in kilowatts)                 50,000                           50,000                
Number of bids received         6                                                    
Number of projects for bidding subject to PUC approval       5                                                     6
Number of photovoltaic projects for bidding subject to PUC approval       4                                                     6
Number of wind projects for bidding subject to PUC approval       1                                                      
Environmental regulation                                                              
Number of EGUs impacted by proposed rules of MATS 14                                                            
Period of extension resulting in MATS compliance date                 1 year                           1 year                
Additional accrued investigation and estimated cleanup costs                     3,600,000   3,600,000   3,100,000                                
Percentage of reduction in GHG emissions by 2020     25.00%                                                        
Period for which operations was stopped prior to merger 4 years                                                            
Annual revenue   5,300,000         547,310,000 579,464,000 1,574,869,000 1,677,604,000 108,699,000 111,249,000 313,740,000 324,664,000     107,924,000 108,490,000 320,314,000 332,558,000 763,933,000 799,203,000 2,208,923,000 2,334,826,000              
Reductions from the interim D&O relate primarily to:                                                              
Lower ROACE                         4,000,000                                    
Customer Information System expenses                         300,000                                    
Pension and OPEB expense based on 3-year average                         1,500,000                                    
Integrated resource planning expenses                         900,000                                    
Operational and Renewable Energy Integration study costs                         1,100,000                                    
Total adjustment                         7,800,000                                    
Stipulated ROACE (as a percent)                         10.00%                                    
Final approved ROACE (as a percent)                         9.00%                                    
Final approved ROACE allocated to lower interest rate (as a percent)                         0.50%                                    
Final approved ROACE allocated for over curtailment of renewable energy (as a percent)                         0.50%                                    
Period for calculating average pension costs                         3 years                                    
Deferred IRP cost allowed by PUC order                         800,000                                    
Charge recorded net of revenue taxes                     7,600,000                                        
Amount to be refunded to customers                         9,700,000                                    
Decrease in employee benefits expenses                     1,800,000                                        
Deferred IRP cost reclassified to deferred accounts                         700,000                                    
Asset retirement obligations                                                              
Impact on earnings from recognition of AROs                 0                                            
Changes in the asset retirement obligation liability                                                              
Balance at the beginning of the period                 48,431,000 50,871,000                                          
Accretion expense                 833,000 1,233,000                                          
Liabilities settled                 (1,165,000) (2,788,000)                                          
Revisions in estimated cash flows                 (916,000) 0                                          
Balance at the end of the period             $ 47,183,000 $ 49,316,000 $ 47,183,000 $ 49,316,000