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Commitments and contingencies - (Details) - HECO (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
extension
Y
EGUs
Mar. 31, 2011
Mar. 31, 2012
Electric utility
Jan. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
Y
Mar. 31, 2012
Hawaiian Electric Company, Inc. and Subsidiaries
mW
Mar. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries
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
Mar. 31, 2012
MECO
Y
Mar. 31, 2011
MECO
Mar. 31, 2012
Campbell Industrial Park 110MW combustion turbine and transmission line
Hawaiian Electric Company, Inc. and Subsidiaries
Mar. 31, 2012
East Oahu transmission project
Dec. 31, 2011
East Oahu transmission project
Hawaiian Electric Company, Inc. and Subsidiaries
Mar. 29, 2012
East Oahu transmission project
Hawaiian Electric Company, Inc. and Subsidiaries
Mar. 31, 2012
East Oahu Transmission Project Phase 1
Mar. 31, 2012
East Oahu Transmission Project Phase 1
Hawaiian Electric Company, Inc. and Subsidiaries
Mar. 31, 2012
East Oahu Transmission Project Phase 2
Apr. 30, 2010
East Oahu Transmission Project Phase 2
Hawaiian Electric Company, Inc. and Subsidiaries
Mar. 31, 2012
East Oahu Transmission Project Phase 2
Hawaiian Electric Company, Inc. and Subsidiaries
Mar. 31, 2012
Customer Information System Project
Dec. 31, 2005
Customer Information System Project
Hawaiian Electric Company, Inc. and Subsidiaries
Mar. 31, 2012
Customer Information System Project
Hawaiian Electric Company, Inc. and Subsidiaries
Feb. 29, 2012
Customer Information System Project
Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory projects and legal obligations                                                
Deferred cost to be recovered subject to PUC approval         $ 3,900,000                                      
Additional deferred cost to be recovered subject to PUC approval         555,000                                      
Integration from renewable energy sources (in megawatts)         200                                      
Revenue recognized with respect to interim rate increase order         49,000,000                                      
Estimated project cost above PUC approval                       32,000,000         43,000,000              
Maintenance costs that can be deferred per annum                                               2,258,000
Cost of project recoverable from increase in annual revenue                       163,000,000                        
Estimated cost of project upon completion                         56,000,000     42,000,000   14,000,000            
Project cost incurred                       195,000,000                        
Allowance for funds used during construction (870,000) (520,000)     (725,000) (408,000)       (94,000) (79,000) 9,000,000                        
Estimated project cost subject to decision and order issued                                 16,000,000              
Amount authorized for the project                                           20,000,000    
Amount authorized for project attributable to capital and deferred costs                                         18,000,000      
Net estimated cost of using smart grid technology                                     10,000,000          
Write-off project cost                                 9,500,000              
Cost of settlement agreement                           6,000,000                    
Annual interim increase in cost of settlement agreement, subject to PUC approval                           5,000,000                    
Annual interim increase to rate base in cost of settlement agreement, subject to PUC approval                           31,000,000                    
Adjustments to annual interim increase in cost of settlement agreement, subject to PUC approval                             5,000,000                  
Estimated cost of smart grid technology                                     15,000,000          
Cost of smart grid technology                                       13,000,000        
Estimated statutory funding for smart grid technology                                     5,000,000          
Statutory funding for smart grid technology                                       4,000,000        
Accumulated project cost                                 59,000,000              
Net actual cost of using smart grid technology                                       9,000,000        
Accumulated project planning and permitting cost                                 12,000,000              
Accumulated project planning and permitting cost after denial of permit                                 24,000,000              
Accumulated cost for allowance for funds used during construction                                 23,000,000              
Deferred and capital cost                                             60,000,000  
Deferred and capital cost recorded                                             52,000,000  
Period for which operations was stopped prior to merger                   4                            
Additional accural for additional investigation and estimated cleanup costs                   3,100,000                            
Reserve for additional investigation and estimated cleanup costs                   3,600,000                            
Environmental regulation                                                
Number of periods allowed for compliance of EPA regulation (in years) 8                                              
Number of EGUs impacted by proposed rules of MATS 14                                              
Number of periods allowed for compliance of MATS rules (in years) 3                                              
Number of extensions allowed for installation of emission control technology 2                                              
Extension periods allowed for installation of emission control technology (in years) 1                                              
Deferral period for GHG permitting requirements for carbon dioxide emissions (in years)       3                                        
Changes in the asset retirement obligation liability                                                
Balance at the beginning of the period       48,630,000 50,871,000 48,630,000   50,871,000 48,630,000                              
Accretion expense         451,000 566,000                                    
Liabilities settled         (210,000) (482,000)                                    
Balance at the end of the period         $ 51,112,000 $ 48,714,000     $ 50,871,000                              
Collective bargaining agreement                                                
Percentage of employees who are members of the International Brotherhood of Electrical Workers     53.00%                                          
Non-compounded wage increase (as a percent)             3.00% 2.50% 1.75%