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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 12, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity Registrant Name Hawaiian Electric Industries, Inc.    
Entity File Number 1-8503    
Entity Tax Identification Number 99-0208097    
Entity Central Index Key 0000354707    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code HI    
Entity Address, Address Line One 1001 Bishop Street, 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 HE    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 3,937,071,331
Entity Common Stock, Shares Outstanding   109,181,124  
Documents Incorporated by Reference
Hawaiian Electric’s Exhibit 99.1, consisting of:
Hawaiian Electric’s Directors, Executive Officers and Corporate Governance—Part III
Hawaiian Electric’s Executive Compensation—Part III
Hawaiian Electric’s Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters—
Part III
Hawaiian Electric’s Certain Relationships and Related Transactions, and Director Independence—Part III
Hawaiian Electric’s Principal Accounting Fees and Services—Part III

Selected sections of Proxy Statement of HEI for the 2021 Annual Meeting of Shareholders to be filed-Part III
 
 
This combined Form 10-K represents separate filings by Hawaiian Electric Industries, Inc. and Hawaiian Electric Company, Inc. Information contained herein relating to any individual registrant is filed by each registrant on its own behalf. Hawaiian Electric makes no representations as to any information not relating to it or its subsidiaries.
 
    
Hawaiian Electric Company, Inc. and Subsidiaries      
Entity Information [Line Items]      
Entity Registrant Name Hawaiian Electric Company, Inc.    
Entity File Number 1-4955    
Entity Tax Identification Number 99-0040500    
Entity Central Index Key 0000046207    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Address, Address Line One 1001 Bishop Street, Suite 2500    
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    
Title of 12(g) Security Cumulative Preferred Stock    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   17,324,376