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Proposed Merger (Details)
 1 Months Ended 11 Months Ended
Oct. 14, 2015
Aug. 31, 2015
USD ($)
Dec. 03, 2014
USD ($)
$ / shares
shares
Jul. 31, 2015
intervener
Jan. 31, 2015
USD ($)
Dec. 31, 2014
complaint
Nov. 26, 2015
entity
Dec. 31, 2030
Dec. 31, 2020
Nov. 27, 2015
USD ($)
Aug. 10, 2015
USD ($)
Business Acquisition [Line Items]                      
Number of purported class action complaints filed | complaint           8          
NextEra Energy, Inc Merger                      
Business Acquisition [Line Items]                      
Merger share conversion ratio | shares     0.2413                
Minimum percentage of shares from which holders approval needed for merger     75.00%                
Merger contract termination fee     $ 90,000,000                
Maximum expenses paid to party for cancellation of merger     $ 5,000,000                
Approximate amount of cumulative savings for customers due to forgone recoveries         $ 60,000,000         $ 60,000,000 $ 62,000,000
Minimum period that entity agrees not to submit applications for general base rate increase         4 years            
Number of parties intervening | intervener       28              
Number of intervening parties opposed | intervener       11              
Number of intervening parties conditionally approved | intervener       11              
Number of parties not making a recommendation | intervener       6              
Consumer advocate recommendations, non-fuel operating and maintenance reductions, revenue requirements, percent   100.00%                  
Consumer advocate recommendations, fund for public interest   $ 2,500,000                  
Consumer advocate recommendations, corporate giving minimum   $ 2,200,000                  
Consumer advocate recommendations, period after business combination closing that the corporate giving requirement is maintained   10 years                  
Consumer advocate recommendations, nondivestiture period   10 years                  
Discovery period 6 months                    
Number of additional entities withdrawing from the agreement | entity             3        
NextEra Energy, Inc Merger | Scenario, Forecast [Member]                      
Business Acquisition [Line Items]                      
Expected renewable portfolio standard by 2030               50.00% 35.00%    
Hawaiian Electric Company, Inc. and Subsidiaries | NextEra Energy, Inc Merger                      
Business Acquisition [Line Items]                      
Special dividend | $ / shares     $ 0.50