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Retirement benefits - Components of Net Periodic Benefit Cost for Consolidated HEI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension benefits    
Defined Benefit Plan    
Service cost $ 11,264 $ 11,396
Interest cost 26,506 25,621
Expected return on plan assets (35,982) (35,195)
Amortization of net prior period gain 0 0
Amortization of net actuarial (gain) losses 111 188
Net periodic pension/benefit cost (return) 1,899 2,010
Impact of PUC D&Os 18,090 18,133
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) 19,989 20,143
Other benefits    
Defined Benefit Plan    
Service cost 281 344
Interest cost 1,867 2,157
Expected return on plan assets (3,485) (3,405)
Amortization of net prior period gain 0 (219)
Amortization of net actuarial (gain) losses (713) (449)
Net periodic pension/benefit cost (return) (2,050) (1,572)
Impact of PUC D&Os 1,888 1,425
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) (162) (147)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits    
Defined Benefit Plan    
Service cost 10,916 11,019
Interest cost 24,627 23,698
Expected return on plan assets (33,777) (32,972)
Amortization of net prior period gain 0 0
Amortization of net actuarial (gain) losses 12 19
Net periodic pension/benefit cost (return) 1,778 1,764
Impact of PUC D&Os 18,090 18,133
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) 19,868 19,897
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits    
Defined Benefit Plan    
Service cost 278 340
Interest cost 1,779 2,063
Expected return on plan assets (3,434) (3,353)
Amortization of net prior period gain 0 (218)
Amortization of net actuarial (gain) losses (694) (434)
Net periodic pension/benefit cost (return) (2,071) (1,602)
Impact of PUC D&Os 1,888 1,425
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) $ (183) $ (177)