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Electric utility segment - Consolidating Statements of Changes in Common Stock Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (decrease) in stockholders' equity                      
Beginning Balance       $ 2,280,260       $ 2,162,280 $ 2,280,260 $ 2,162,280 $ 2,097,386
Net income for common stock $ 50,485 $ 65,032 $ 48,887 33,420 $ 66,263 $ 63,419 $ 42,512 45,688 197,824 217,882 201,774
Other comprehensive income (loss), net of taxes (benefits)                 18,775 30,571 (8,669)
Common stock dividends                 (144,096) (139,463) (134,987)
Ending Balance 2,337,502       2,280,260       2,337,502 2,280,260 2,162,280
Hawaiian Electric (parent only)                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       2,280,260         2,280,260    
Ending Balance 2,337,502       2,280,260       2,337,502 2,280,260  
Eliminations And Reconciling Items                      
Increase (decrease) in stockholders' equity                      
Dissolution of subsidiary                 24    
Hawaiian Electric Company, Inc. and Subsidiaries                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       2,047,352       1,957,641 2,047,352 1,957,641 1,845,283
Net income for common stock 43,041 $ 60,065 $ 42,329 23,905 45,361 $ 46,779 $ 32,574 32,126 169,340 156,840 143,653
Other comprehensive income (loss), net of taxes (benefits)                 (1,640) (1,378) 1,318
Issuance of common stock, net of expenses                 34,000 35,501 70,692
Common stock dividends                 (107,134) (101,252) (103,305)
Dissolution of subsidiary                 0    
Ending Balance 2,141,918       2,047,352       2,141,918 2,047,352 1,957,641
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Hawaiian Electric (parent only)                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       2,047,352       1,957,641 2,047,352 1,957,641 1,845,283
Net income for common stock                 169,340 156,840 143,653
Other comprehensive income (loss), net of taxes (benefits)                 (1,640) (1,378) 1,318
Issuance of common stock, net of expenses                 34,000 35,501 70,692
Common stock dividends                 (107,134) (101,252) (103,305)
Ending Balance 2,141,918       2,047,352       2,141,918 2,047,352 1,957,641
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | HELCO                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       298,998       295,874 298,998 295,874 286,647
Net income for common stock                 27,493 20,817 24,481
Other comprehensive income (loss), net of taxes (benefits)                 (220) (12) 34
Issuance of common stock, net of expenses                 7,500 (1) 1
Common stock dividends                 (16,320) (17,680) (15,289)
Ending Balance 317,451       298,998       317,451 298,998 295,874
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Maui Electric                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       292,870       280,863 292,870 280,863 270,265
Net income for common stock                 20,011 22,350 20,912
Other comprehensive income (loss), net of taxes (benefits)                 (134) (174) 207
Issuance of common stock, net of expenses                 11,000 4,899 1,498
Common stock dividends                 (14,384) (15,068) (12,019)
Ending Balance 309,363       292,870       309,363 292,870 280,863
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Other subsidiaries                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       101       101 101 101 101
Net income for common stock                 0 0 0
Other comprehensive income (loss), net of taxes (benefits)                 0 0 0
Ending Balance 77       101       77 101 101
Hawaiian Electric Company, Inc. and Subsidiaries | Consolidating Adjustments                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       $ (591,969)       $ (576,838) (591,969) (576,838) (557,013)
Net income for common stock                 (47,504) (43,167) (45,393)
Other comprehensive income (loss), net of taxes (benefits)                 354 186 (241)
Issuance of common stock, net of expenses                 (18,500) (4,898) (1,499)
Common stock dividends                 30,704 32,748 27,308
Ending Balance $ (626,891)       $ (591,969)       (626,891) $ (591,969) $ (576,838)
Renewable Hawaii and Uluwehiokama Biofuels Company | Reportable Legal Entities                      
Increase (decrease) in stockholders' equity                      
Dissolution of subsidiary                 $ (24)