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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost for Consolidated HEI
The components of net periodic pension costs and net periodic benefit costs 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)20252024202520242025202420252024
HEI consolidated
Service cost$10,900 $11,973 $245 $270 $30,796 $34,327 $741 $833 
Interest cost27,999 25,478 1,819 1,803 80,608 76,376 5,461 5,525 
Expected return on plan assets(33,845)(34,606)(3,512)(3,490)(101,558)(103,800)(10,532)(10,462)
Amortization of net actuarial (gain)/losses79 123 (808)(758)209 251 (2,300)(2,172)
Net periodic pension/benefit cost (return)5,133 2,968 (2,256)(2,175)10,055 7,154 (6,630)(6,276)
Impact of PUC D&Os15,200 17,406 2,138 2,052 50,799 53,585 6,187 5,827 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$20,333 $20,374 $(118)$(123)$60,854 $60,739 $(443)$(449)
Hawaiian Electric consolidated
Service cost$10,655 $11,670 $242 $266 $30,065 $33,502 $732 $822 
Interest cost27,101 24,615 1,731 1,721 77,960 73,869 5,212 5,279 
Expected return on plan assets(33,041)(33,769)(3,464)(3,438)(99,142)(101,321)(10,387)(10,306)
Amortization of net actuarial (gain)/losses34 51 (811)(742)81 74 (2,285)(2,130)
Net periodic pension/benefit cost (return)4,749 2,567 (2,302)(2,193)8,964 6,124 (6,728)(6,335)
Impact of PUC D&Os15,200 17,406 2,138 2,052 50,799 53,585 6,187 5,827 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$19,949 $19,973 $(164)$(141)$59,763 $59,709 $(541)$(508)