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Retirement benefits - Components of Net Periodic Benefit Cost for Consolidated HEI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension benefits        
Defined Benefit Plan        
Service cost $ 9,948 $ 11,178 $ 19,896 $ 22,354
Interest cost 26,304 25,449 52,609 50,898
Expected return on plan assets (33,856) (34,598) (67,713) (69,194)
Amortization of net actuarial (gain)/losses 65 64 130 128
Net periodic pension/benefit cost (return) 2,461 2,093 4,922 4,186
Impact of PUC D&Os 17,800 18,089 35,599 36,179
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) 20,261 20,182 40,521 40,365
Other benefits        
Defined Benefit Plan        
Service cost 248 282 496 563
Interest cost 1,821 1,861 3,642 3,722
Expected return on plan assets (3,510) (3,487) (7,020) (6,972)
Amortization of net actuarial (gain)/losses (746) (706) (1,492) (1,414)
Net periodic pension/benefit cost (return) (2,187) (2,050) (4,374) (4,101)
Impact of PUC D&Os 2,024 1,887 4,049 3,775
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) (163) (163) (325) (326)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits        
Defined Benefit Plan        
Service cost 9,705 10,916 19,410 21,832
Interest cost 25,430 24,627 50,859 49,254
Expected return on plan assets (33,052) (33,775) (66,101) (67,552)
Amortization of net actuarial (gain)/losses 24 11 47 23
Net periodic pension/benefit cost (return) 2,107 1,779 4,215 3,557
Impact of PUC D&Os 17,800 18,089 35,599 36,179
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) 19,907 19,868 39,814 39,736
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits        
Defined Benefit Plan        
Service cost 245 278 490 556
Interest cost 1,740 1,779 3,481 3,558
Expected return on plan assets (3,461) (3,434) (6,923) (6,868)
Amortization of net actuarial (gain)/losses (737) (694) (1,474) (1,388)
Net periodic pension/benefit cost (return) (2,213) (2,071) (4,426) (4,142)
Impact of PUC D&Os 2,024 1,887 4,049 3,775
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) $ (189) $ (184) $ (377) $ (367)