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Retirement benefits (Tables)
 6 Months Ended
Jun. 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 June 30Six months ended June 30
 Pension benefitsOther benefitsPension benefitsOther benefits
(in thousands)20202019202020192020201920202019
HEI consolidated
Service cost$18,362  $15,382  $631  $542  $36,725  $30,764  $1,262  $1,083  
Interest cost20,164  21,033  1,856  1,997  40,327  42,066  3,711  3,994  
Expected return on plan assets(28,465) (27,999) (3,039) (3,086) (56,931) (55,997) (6,077) (6,172) 
Amortization of net prior period (gain)/cost
2  (11) (441) (452) 5  (22) (881) (904) 
Amortization of net actuarial (gains)/losses
8,058  3,839  51  (4) 16,115  7,678  101  (7) 
Net periodic pension/benefit cost (return)
18,121  12,244  (942) (1,003) 36,241  24,489  (1,884) (2,006) 
Impact of PUC D&Os6,261  12,278  777  811  12,523  24,557  1,554  1,622  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
$24,382  $24,522  $(165) $(192) $48,764  $49,046  $(330) $(384) 
Hawaiian Electric consolidated
Service cost$17,891  $15,001  $625  $538  $35,782  $30,002  $1,251  $1,075  
Interest cost18,715  19,414  1,781  1,918  37,430  38,828  3,563  3,835  
Expected return on plan assets(26,857) (26,164) (2,990) (3,036) (53,712) (52,328) (5,980) (6,071) 
Amortization of net prior period (gain)/cost
3  2  (439) (451) 5  4  (879) (902) 
Amortization of net actuarial losses
7,369  3,576  51  —  14,737  7,152  102  —  
Net periodic pension/benefit cost (return)
17,121  11,829  (972) (1,031) 34,242  23,658  (1,943) (2,063) 
Impact of PUC D&Os6,261  12,278  777  811  12,523  24,557  1,554  1,622  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
$23,382  $24,107  $(195) $(220) $46,765  $48,215  $(389) $(441)