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Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
General payment period (in days) 30 days    
Revenues from contracts with customers $ 3,297,286 $ 3,465,215  
Revenues from other sources 384,880 276,770  
Total revenues 3,682,166 3,741,985 $ 2,850,379
Services/goods transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 48,781 48,883  
Services/goods transferred over time      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 3,248,505 3,416,332  
Hawaiian Electric Company, Inc. and Subsidiaries      
Disaggregation of Revenue [Line Items]      
Revenue taxes, other than income tax expense 291,000 303,000 226,000
Revenue taxes accrued 182,000 188,000  
Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 3,230,965 3,404,528  
Revenues from other sources 38,556 4,059  
Total revenues 3,269,521 3,408,587 2,539,636
Electric utility | Services/goods transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Electric utility | Services/goods transferred over time      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 3,230,965 3,404,528  
Bank      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 48,781 48,883  
Revenues from other sources 345,882 272,185  
Total revenues 394,663 321,068 306,398
Bank | Services/goods transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 48,781 48,883  
Bank | Services/goods transferred over time      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 17,540 11,804  
Revenues from other sources 442 526  
Total revenues 17,982 12,330 $ 4,345
Other | Services/goods transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Other | Services/goods transferred over time      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 17,540 11,804  
Electric energy sales - residential      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,026,321 1,078,372  
Electric energy sales - residential | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,026,321 1,078,372  
Electric energy sales - residential | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Electric energy sales - residential | Other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Electric energy sales - commercial      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,044,045 1,087,485  
Electric energy sales - commercial | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,044,045 1,087,485  
Electric energy sales - commercial | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Electric energy sales - commercial | Other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Electric energy sales - large light and power      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,141,128 1,221,608  
Electric energy sales - large light and power | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,141,128 1,221,608  
Electric energy sales - large light and power | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Electric energy sales - large light and power | Other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Electric energy sales - other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 19,471 17,063  
Electric energy sales - other | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 19,471 17,063  
Electric energy sales - other | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Electric energy sales - other | Other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Bank fees      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 48,781 48,883  
Bank fees | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Bank fees | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 48,781 48,883  
Bank fees | Other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Other sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 17,540 11,804  
Other sales | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Other sales | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0  
Other sales | Other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 17,540 11,804  
Regulatory revenue      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 3,708 (29,124)  
Regulatory revenue | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 3,708 (29,124)  
Regulatory revenue | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 0 0  
Regulatory revenue | Other      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 0 0  
Bank interest and dividend income      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 334,783 265,874  
Bank interest and dividend income | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 0 0  
Bank interest and dividend income | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 334,783 265,874  
Bank interest and dividend income | Other      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 0 0  
Other bank noninterest income      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 11,099 6,311  
Other bank noninterest income | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 0 0  
Other bank noninterest income | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 11,099 6,311  
Other bank noninterest income | Other      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 0 0  
Other      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 35,290 33,709  
Other | Electric utility      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 34,848 33,183  
Other | Bank      
Disaggregation of Revenue [Line Items]      
Revenues from other sources 0 0  
Other | Other      
Disaggregation of Revenue [Line Items]      
Revenues from other sources $ 442 $ 526