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Retirement benefits (Tables)
 6 Months Ended
Jun. 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 June 30Six months ended June 30
 Pension benefitsOther benefitsPension benefitsOther benefits
(in thousands)20232022202320222023202220232022
HEI consolidated
Service cost$11,396 $19,823 $343 $657 $22,792 $39,647 $687 $1,313 
Interest cost25,622 19,810 2,157 1,638 51,243 39,621 4,314 3,275 
Expected return on plan assets(35,197)(35,331)(3,405)(3,398)(70,392)(70,664)(6,810)(6,795)
Amortization of net prior period gain— — (219)(232)— — (438)(464)
Amortization of net actuarial (gain)/losses189 6,297 (449)(3)377 12,594 (898)(6)
Net periodic pension/benefit cost (return)
2,010 10,599 (1,573)(1,338)4,020 21,198 (3,145)(2,677)
Impact of PUC D&Os18,133 9,552 1,424 1,217 36,266 19,103 2,849 2,436 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$20,143 $20,151 $(149)$(121)$40,286 $40,301 $(296)$(241)
Hawaiian Electric consolidated
Service cost$11,018 $19,317 $340 $649 $22,037 $38,635 $680 $1,298 
Interest cost23,699 18,461 2,063 1,572 47,397 36,923 4,126 3,145 
Expected return on plan assets(32,971)(33,545)(3,354)(3,345)(65,943)(67,091)(6,707)(6,692)
Amortization of net prior period gain— — (218)(231)— — (436)(462)
Amortization of net actuarial (gain)/losses18 6,125 (433)— 37 12,250 (867)— 
Net periodic pension/benefit cost (return)
1,764 10,358 (1,602)(1,355)3,528 20,717 (3,204)(2,711)
Impact of PUC D&Os18,133 9,552 1,424 1,217 36,266 19,103 2,849 2,436 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$19,897 $19,910 $(178)$(138)$39,794 $39,820 $(355)$(275)