Pension and Other Postemployment Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Costs
The components of the consolidated net periodic cost (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 September 30
 
2016

2015

2016

2015
 
 
(In millions)
Service costs
 
$
48

 
$
49

 
$
2

 
$
2

Interest costs
 
99

 
96

 
7

 
7

Expected return on plan assets
 
(100
)
 
(111
)
 
(7
)
 
(9
)
Amortization of prior service costs (credits)
 
2

 
2

 
(20
)
 
(33
)
Net periodic costs (credits)
 
$
49

 
$
36

 
$
(18
)
 
$
(33
)
 
 
 
 
 
 
 
 
 
Components of Net Periodic Benefit Costs (Credits)
 
Pension
OPEB
For the Nine Months Ended September 30
 
2016
 
2015
 
2016
 
2015
 
 
(In millions)
Service costs
 
$
144

 
$
145

 
$
4

 
$
4

Interest costs
 
298

 
288

 
22

 
21

Expected return on plan assets
 
(297
)
 
(333
)
 
(23
)
 
(25
)
Amortization of prior service costs (credits)
 
6

 
6

 
(60
)
 
(100
)
Net periodic costs (credits)
 
$
151

 
$
106

 
$
(57
)
 
$
(100
)
Net Periodic Pension and OPEB Costs
FES' share of the net periodic pension and OPEB costs (credits) were as follows:
 
 
Pension
OPEB
 
 
2016
 
2015
 
2016
 
2015
 
 
(In millions)
For the Three Months Ended September 30
 
$
6

 
$
4

 
$
(4
)
 
$
(5
)
For the Nine Months Ended September 30
 
18

 
12

 
(12
)
 
(15
)


Pension and OPEB obligations are allocated to FE's subsidiaries, including FES, employing the plan participants. The net periodic pension and OPEB costs (credits), net of amounts capitalized, recognized in earnings by FirstEnergy and FES were as follows:
Net Periodic Benefit Expense (Credit)
 
Pension
 
OPEB
For the Three Months Ended September 30
 
2016
 
2015
 
2016
 
2015
 
 
(In millions)
FirstEnergy
 
$
35

 
$
25

 
$
(11
)
 
$
(21
)
FES
 
5

 
4

 
(4
)
 
(4
)
 
 
 
 
 
 
 
 
 
Net Periodic Benefit Expense (Credit)
 
Pension
 
OPEB
For the Nine Months Ended September 30
 
2016
 
2015
 
2016
 
2015
 
 
(In millions)
FirstEnergy
 
$
107

 
$
74

 
$
(41
)
 
$
(66
)
FES
 
17

 
12

 
(12
)
 
(12
)