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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost for Consolidated HEI The components of net periodic pension costs (NPPC) and net periodic benefit costs (NPBC) for HEI consolidated and Hawaiian Electric consolidated were as follows:
Three months ended September 30Nine months ended September 30
 Pension benefitsOther benefitsPension benefitsOther benefits
(in thousands)20232022202320222023202220232022
HEI consolidated
Service cost$11,418 $18,831 $385 $624 $34,210 $58,478 $1,072 $1,937 
Interest cost26,022 20,274 2,075 1,593 77,265 59,895 6,389 4,868 
Expected return on plan assets(35,238)(35,163)(3,426)(3,394)(105,630)(105,827)(10,236)(10,189)
Amortization of net prior period gain— — (218)(232)— — (656)(696)
Amortization of net actuarial (gain)/losses138 7,782 (518)(3)515 20,376 (1,416)(9)
Net periodic pension/benefit cost (return)
2,340 11,724 (1,702)(1,412)6,360 32,922 (4,847)(4,089)
Impact of PUC D&Os17,663 8,758 1,536 1,289 53,929 27,861 4,385 3,725 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$20,003 $20,482 $(166)$(123)$60,289 $60,783 $(462)$(364)
Hawaiian Electric consolidated
Service cost$11,071 $18,248 $380 $617 $33,108 $56,883 $1,060 $1,915 
Interest cost24,116 18,850 1,981 1,525 71,513 55,773 6,107 4,670 
Expected return on plan assets(33,029)(33,314)(3,374)(3,343)(98,972)(100,405)(10,081)(10,035)
Amortization of net prior period gain— — (218)(232)— — (654)(694)
Amortization of net actuarial (gain)/losses(16)7,519 (503)— 21 19,769 (1,370)— 
Net periodic pension/benefit cost (return)
2,142 11,303 (1,734)(1,433)5,670 32,020 (4,938)(4,144)
Impact of PUC D&Os17,663 8,758 1,536 1,289 53,929 27,861 4,385 3,725 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$19,805 $20,061 $(198)$(144)$59,599 $59,881 $(553)$(419)