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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 15, 2023
Jun. 30, 2022
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
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 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     $ 4,477,193,306
Entity Common Stock, Shares Outstanding   109,472,304  
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 2023 Annual Meeting of Shareholders to be filed-Part III
    
Entity Central Index Key 0000354707    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Hawaiian Electric Company, Inc. and Subsidiaries      
Entity Information [Line Items]      
Current Fiscal Year End Date --12-31    
Entity Registrant Name Hawaiian Electric Company, Inc.    
Entity File Number 1-4955    
Entity Tax Identification Number 99-0040500    
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    
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   17,854,278  
Entity Central Index Key 0000046207    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY