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Proposed Merger (Details)
 1 Months Ended 2 Months Ended
Nov. 27, 2015
USD ($)
entity
Oct. 14, 2015
Aug. 31, 2015
USD ($)
Aug. 10, 2015
USD ($)
Dec. 03, 2014
USD ($)
$ / shares
shares
Jul. 31, 2015
intervener
Jan. 31, 2015
USD ($)
Jan. 21, 2015
complaint
Dec. 31, 2045
Dec. 31, 2030
Dec. 31, 2020
Business Acquisition [Line Items]                      
Number of purported class action complaints filed | complaint               8      
Scenario, Forecast                      
Business Acquisition [Line Items]                      
Expected portfolio standard                 100.00%    
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            
Minimum period that entity agrees not to submit applications for general base rate increase             4 years        
Approximate amount of cumulative savings for customers due to forgone recoveries             $ 60,000,000        
Number of interveners | intervener           28          
Number of interveners who opposed | intervener           11          
Number of interveners opposed who approved conditionally | intervener           11          
Number of interveners who made no recommendation | intervener           6          
Consumer advocate recommendation, permanent reduction in annual utility rate, amount $ 60,000,000     $ 62,000,000              
Non-fuel O&M savings requirements     100.00%                
Fund for public interest     $ 2,500,000                
Corporate giving minimum     $ 2,200,000                
Years post-closing for corporate giving minimum     10 years                
Years post-closing for commitment not to sell utilities or holding company     10 years                
Discovery period   6 months                  
Number of additional entities withdrawing from the agreement | entity 3                    
NextEra Energy, Inc Merger | Scenario, Forecast                      
Business Acquisition [Line Items]                      
Expected portfolio standard                   35.00% 50.00%
NextEra Energy, Inc Merger | Hawaiian Electric Company, Inc. and Subsidiaries                      
Business Acquisition [Line Items]                      
Special dividend | $ / shares         $ 0.50