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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2015
Apr. 30, 2015
Entity Information [Line Items]    
Entity Registrant Name HAWAIIAN ELECTRIC INDUSTRIES INC  
Entity Central Index Key 0000354707  
Document Type 10-Q  
Document Period End Date Mar. 31, 2015  
Amendment Flag true  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   107,417,644
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Amendment Description HEI and Hawaiian Electric are filing this Amendment No. 1 on Form 10-Q/A (the Amended Filing) to amend certain parts of their Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2015, originally filed with the Securities and Exchange Commission (SEC) on May 6, 2015 (the Original Filing).  
Hawaiian Electric Company, Inc. and Subsidiaries    
Entity Information [Line Items]    
Entity Registrant Name HAWAIIAN ELECTRIC COMPANY INC  
Entity Central Index Key 0000046207  
Document Type 10-Q  
Document Period End Date Mar. 31, 2015  
Amendment Flag true  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   15,805,327
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1