XML 107 R1.htm IDEA: XBRL DOCUMENT v2.4.1.9
Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Feb. 13, 2015
Jun. 30, 2014
Entity Information [Line Items]      
Entity Registrant Name HAWAIIAN ELECTRIC INDUSTRIES INC    
Entity Central Index Key 0000354707    
Document Type 10-K    
Document Period End Date Dec. 31, 2014    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 2,571,503,656dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding   102,710,867dei_EntityCommonStockSharesOutstanding  
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
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-K    
Document Period End Date Dec. 31, 2014    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 0dei_EntityPublicFloat
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Entity Common Stock, Shares Outstanding   15,805,327dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember		  
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY