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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2020
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)20202019202020192020201920202019
HEI consolidated
Service cost$18,341 $15,800 $641 $573 $55,066 $46,564 $1,903 $1,656 
Interest cost20,660 21,150 1,842 2,006 60,987 63,216 5,553 6,000 
Expected return on plan assets(28,422)(27,991)(3,023)(3,101)(85,353)(83,988)(9,100)(9,273)
Amortization of net prior period (gain)/cost
2 (10)(474)(451)7 (32)(1,355)(1,355)
Amortization of net actuarial (gains)/losses
8,944 3,989 53 (3)25,059 11,667 154 (10)
Net periodic pension/benefit cost (return)
19,525 12,938 (961)(976)55,766 37,427 (2,845)(2,982)
Impact of PUC D&Os4,976 11,554 835 821 17,499 36,111 2,389 2,443 
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
$24,501 $24,492 $(126)$(155)$73,265 $73,538 $(456)$(539)
Hawaiian Electric consolidated
Service cost$17,921 $15,344 $635 $568 $53,703 $45,346 $1,886 $1,643 
Interest cost19,183 19,560 1,764 1,920 56,613 58,388 5,327 5,755 
Expected return on plan assets(26,815)(26,146)(2,986)(3,064)(80,527)(78,474)(8,966)(9,135)
Amortization of net prior period (gain)/cost
1 2 (474)(451)6 6 (1,353)(1,353)
Amortization of net actuarial losses
8,188 3,841 53 — 22,925 10,993 155 — 
Net periodic pension/benefit cost (return)
18,478 12,601 (1,008)(1,027)52,720 36,259 (2,951)(3,090)
Impact of PUC D&Os4,976 11,554 835 821 17,499 36,111 2,389 2,443 
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
$23,454 $24,155 $(173)$(206)$70,219 $72,370 $(562)$(647)