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Cover Page - shares
3 Months Ended
Mar. 31, 2024
May 03, 2024
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2024  
Document Transition Report false  
Entity Registrant Name HAWAIIAN ELECTRIC INDUSTRIES, INC.  
Entity File Number 1-8503  
Entity Tax Identification Number 99-0208097  
Entity Incorporation, State or Country Code HI  
Entity Address, Address Line One 1001 Bishop Street  
Entity Address, Address Line Two Suite 2900  
Entity Address, City or Town Honolulu  
Entity Address, State or Province HI  
Entity Address, Postal Zip Code 96813  
City Area Code 808  
Local Phone Number 543-5662  
Title of 12(b) Security Common Stock, Without Par Value  
Trading Symbol(s) HE  
Name of each exchange on which registered NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   110,302,667
Entity Central Index Key 0000354707  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q1  
Hawaiian Electric Company, Inc. and Subsidiaries    
Entity Information [Line Items]    
Document Type 10-Q  
Entity Registrant Name HAWAIIAN ELECTRIC COMPANY, INC.  
Entity File Number 1-4955  
Entity Tax Identification Number 99-0040500  
Entity Incorporation, State or Country Code HI  
Entity Address, Address Line One 1099 Alakea Street  
Entity Address, Address Line Two Suite 2200  
Entity Address, City or Town Honolulu  
Entity Address, State or Province HI  
Entity Address, Postal Zip Code 96813  
City Area Code 808  
Local Phone Number 543-7771  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   17,854,278
Entity Central Index Key 0000046207  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q1