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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]      
Less unamortized debt issuance costs $ (2,599,000) $ (2,007,000)  
Long-term debt, net—other than bank 1,879,641,000 1,683,797,000  
2019 4,000,000    
2020 100,000,000    
2021 54,000,000    
2022 206,000,000    
2023 154,000,000    
Issuance of common stock, net of expenses     $ 26,844,000
Common stock      
Condensed Financial Statements, Captions [Line Items]      
Issuance of common stock, net of expenses     26,844,000
Hamakua Energy Partners, L.P. (HEP)      
Condensed Financial Statements, Captions [Line Items]      
Notes receivable converted into equity   3,600,000  
Self Insured United States Longshore and Horbor Bond      
Condensed Financial Statements, Captions [Line Items]      
Maximum undiscounted exposure 600,000    
Self Insured Automobile Bond      
Condensed Financial Statements, Captions [Line Items]      
Maximum undiscounted exposure 700,000    
Hawaiian Electric Industries, Inc.      
Condensed Financial Statements, Captions [Line Items]      
Less unamortized debt issuance costs (1,126,000) (412,000)  
Long-term debt, net—other than bank 398,874,000 249,588,000  
2019 0    
2020 0    
2021 50,000,000    
2022 150,000,000    
2023 50,000,000    
Cash dividends paid 154,000,000 125,000,000 130,000,000
Hawaiian Electric Industries, Inc. | Common stock      
Condensed Financial Statements, Captions [Line Items]      
Issuance of common stock, net of expenses 0 0 17,000,000
Hawaiian Electric Industries, Inc. | ASB Hawaii, Inc. | Consolidated subsidiary      
Condensed Financial Statements, Captions [Line Items]      
Accounts receivable reduction 2,300,000 2,800,000 2,300,000
HEI notes payable increase to ASHI 2,300,000 2,800,000 $ 2,300,000
Hawaiian Electric Industries, Inc. | HEI loan 2.99%, due 2022      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 150,000,000 150,000,000  
Debt instrument, stated interest rate 2.99%    
Hawaiian Electric Industries, Inc. | HEI 5.67% senior notes, due 2021      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 50,000,000 50,000,000  
Debt instrument, stated interest rate 5.67%    
Hawaiian Electric Industries, Inc. | HEI 3.99% senior notes, due 2023      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 50,000,000 50,000,000  
Debt instrument, stated interest rate 3.99%    
Hawaiian Electric Industries, Inc. | HEI 4.58% senior notes, due 2025      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 50,000,000 0  
Debt instrument, stated interest rate 4.58%    
Hawaiian Electric Industries, Inc. | HEI 4.72% senior notes, due 2028      
Condensed Financial Statements, Captions [Line Items]      
Gross long-term debt $ 100,000,000 $ 0  
Debt instrument, stated interest rate 4.72%