XML 91 R78.htm IDEA: XBRL DOCUMENT v3.23.1
Retirement benefits - Components of NPPC and NPBC (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension benefits    
Defined Benefit Plan    
Service cost $ 11,396 $ 19,824
Interest cost 25,621 19,811
Expected return on plan assets (35,195) (35,333)
Amortization of net prior period gain 0 0
Amortization of net actuarial (gain) losses 188 6,297
Net periodic pension/benefit cost (return) 2,010 10,599
Impact of PUC D&Os 18,133 9,551
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) 20,143 20,150
Other benefits    
Defined Benefit Plan    
Service cost 344 656
Interest cost 2,157 1,637
Expected return on plan assets (3,405) (3,397)
Amortization of net prior period gain (219) (232)
Amortization of net actuarial (gain) losses (449) (3)
Net periodic pension/benefit cost (return) (1,572) (1,339)
Impact of PUC D&Os 1,425 1,219
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) (147) (120)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits    
Defined Benefit Plan    
Service cost 11,019 19,318
Interest cost 23,698 18,462
Expected return on plan assets (32,972) (33,546)
Amortization of net prior period gain 0 0
Amortization of net actuarial (gain) losses 19 6,125
Net periodic pension/benefit cost (return) 1,764 10,359
Impact of PUC D&Os 18,133 9,551
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) 19,897 19,910
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits    
Defined Benefit Plan    
Service cost 340 649
Interest cost 2,063 1,573
Expected return on plan assets (3,353) (3,347)
Amortization of net prior period gain (218) (231)
Amortization of net actuarial (gain) losses (434) 0
Net periodic pension/benefit cost (return) (1,602) (1,356)
Impact of PUC D&Os 1,425 1,219
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) $ (177) $ (137)