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Pension and Other Postemployment Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The components of the consolidated net periodic costs (credits) for pension and OPEB (including amounts capitalized) were as follows:
Components of Net Periodic Benefit Costs (Credits)
 
Pension
OPEB
For the Three Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
 
(In millions)
Service costs
 
$
56

 
$
52

 
$
1

 
$
1

Interest costs
 
93

 
97

 
6

 
7

Expected return on plan assets
 
(144
)
 
(112
)
 
(7
)
 
(7
)
Amortization of prior service costs (credits)
 
2

 
2

 
(20
)
 
(20
)
Net periodic costs (credits)
 
$
7

 
$
39

 
$
(20
)
 
$
(19
)
 
 
 
 
 
 
 
 
 
Components of Net Periodic Benefit Costs (Credits)
 
Pension
OPEB
For the Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
 
(In millions)
Service costs
 
$
112

 
$
104

 
$
2

 
$
2

Interest costs
 
186

 
194

 
12

 
14

Expected return on plan assets
 
(288
)
 
(224
)
 
(15
)
 
(15
)
Amortization of prior service costs (credits)
 
4

 
4

 
(40
)
 
(40
)
Net periodic costs (credits)
 
$
14

 
$
78

 
$
(41
)
 
$
(39
)
Net Periodic Pension and OPEB Costs
Pension and OPEB obligations are allocated to FE's subsidiaries employing the plan participants. The net periodic pension and OPEB costs (credits), net of amounts capitalized, recognized in earnings by FirstEnergy were as follows:
 
 
Pension
 
OPEB
Net Periodic Benefit Expense (Credit)
 
2018
 
2017
 
2018
 
2017
 
 
(In millions)
For the Three Months Ended June 30,
 
$
(18
)
 
$
27

 
$
(21
)
 
$
(14
)
For the Six Months Ended June 30,
 
$
(32
)
 
$
59

 
$
(42
)
 
$
(29
)