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Electric utility segment - Condensed Consolidating Statement of Changes in Common Stock Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Increase (decrease) in stockholders' equity            
Beginning balance $ 2,237,955 $ 2,202,499 $ 2,303,642 $ 2,390,884 $ 2,202,499 $ 2,390,884
Net income for common stock 54,610 54,721 52,541 69,167 109,331 121,708
Other comprehensive loss, net of taxes (7,609) 20,488 (87,840) (117,159) 12,879 (204,999)
Common stock dividends (39,447) (39,446) (38,301) (38,301)    
Ending balance 2,249,377 2,237,955 2,233,504 2,303,642 2,249,377 2,233,504
Hawaiian Electric Consolidated            
Increase (decrease) in stockholders' equity            
Beginning balance 2,358,884 2,344,170 2,276,884 2,261,899 2,344,170 2,261,899
Net income for common stock 45,299 47,009 44,135 46,409 92,308 90,544
Other comprehensive loss, net of taxes (44) (45) 51 51 (89) 102
Common stock dividends (32,250) (32,250) (31,475) (31,475) (64,500) (62,950)
Ending balance 2,371,889 2,358,884 2,289,595 2,276,884 2,371,889 2,289,595
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric            
Increase (decrease) in stockholders' equity            
Beginning balance   2,344,170   2,261,899 2,344,170 2,261,899
Net income for common stock 45,299   44,135   92,308 90,544
Other comprehensive loss, net of taxes (44)   51   (89) 102
Common stock dividends         (64,500) (62,950)
Ending balance 2,371,889   2,289,595   2,371,889 2,289,595
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light            
Increase (decrease) in stockholders' equity            
Beginning balance   344,720   332,900 344,720 332,900
Net income for common stock 7,075   5,658   13,465 13,035
Other comprehensive loss, net of taxes (2)   2   (8) 2
Common stock dividends         (8,950) (8,200)
Ending balance 349,227   337,737   349,227 337,737
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric            
Increase (decrease) in stockholders' equity            
Beginning balance   357,036   343,260 357,036 343,260
Net income for common stock 4,339   6,579   9,490 12,863
Other comprehensive loss, net of taxes (9)   1   (15) 1
Common stock dividends         (7,350) (7,600)
Ending balance 359,161   348,524   359,161 348,524
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiary            
Increase (decrease) in stockholders' equity            
Beginning balance   77   77 77 77
Net income for common stock 0   0   0 0
Other comprehensive loss, net of taxes 0   0   0 0
Ending balance 77   77   77 77
Hawaiian Electric Consolidated | Consolidating adjustments            
Increase (decrease) in stockholders' equity            
Beginning balance   $ (701,833)   $ (676,237) (701,833) (676,237)
Net income for common stock (11,414)   (12,237)   (22,955) (25,898)
Other comprehensive loss, net of taxes 11   (3)   23 (3)
Common stock dividends         16,300 15,800
Ending balance $ (708,465)   $ (686,338)   $ (708,465) $ (686,338)