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Shareholders' equity - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance $ 1,085,273 $ 2,377,380 $ 2,344,841 $ 2,249,377 $ 2,237,955 $ 2,202,499 $ 2,344,841 $ 2,202,499
Current period other comprehensive income (loss) 39,360 1,594 (9,801) (34,875) (7,609) 20,488 31,153 (21,996)
Ending balance 1,577,041 1,085,273 2,377,380 2,224,354 2,249,377 2,237,955 1,577,041 2,224,354
AOCI                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (297,557) (299,151) (289,350) (323,149) (315,540) (336,028) (289,350) (336,028)
Current period other comprehensive income (loss) 39,360 1,594 (9,801) (34,875) (7,609) 20,488    
Ending balance (258,197) (297,557) (299,151) (358,024) (323,149) (315,540) (258,197) (358,024)
Net unrealized gains (losses) on securities                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance     (282,963)     (328,904) (282,963) (328,904)
Current period other comprehensive income (loss)             31,260 (21,330)
Ending balance (251,703)     (350,234)     (251,703) (350,234)
Unrealized gains (losses) on derivatives                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance     1,638     1,991 1,638 1,991
Current period other comprehensive income (loss)             (220) (827)
Ending balance 1,418     1,164     1,418 1,164
Retirement benefit plans                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance     (8,025)     (9,115) (8,025) (9,115)
Current period other comprehensive income (loss)             113 161
Ending balance (7,912)     (8,954)     (7,912) (8,954)
Hawaiian Electric Company, Inc. and Subsidiaries                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 1,192,842 2,435,282 2,409,110 2,371,889 2,358,884 2,344,170 2,409,110 2,344,170
Current period other comprehensive income (loss) 2 (46) (49) (77) (44) (45) (93) (166)
Ending balance 1,110,259 1,192,842 2,435,282 2,383,023 2,371,889 2,358,884 1,110,259 2,383,023
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 2,754 2,800 2,849 2,772 2,816 2,861 2,849 2,861
Current period other comprehensive income (loss) 2 (46) (49) (77) (44) (45)    
Ending balance 2,756 $ 2,754 2,800 2,695 $ 2,772 2,816 2,756 2,695
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance     $ 2,849     $ 2,861 2,849 2,861
Current period other comprehensive income (loss)             (93) (166)
Ending balance $ 2,756     $ 2,695     $ 2,756 $ 2,695