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Pension and Other Postemployment Benefits (Tables)
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Costs
The components of the consolidated net periodic cost for pensions and OPEB (including amounts capitalized) were as follows:

Components of Net Periodic Benefit Costs (Credits)
 
Pensions
OPEB
For the Three Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
 
(In millions)
Service costs
 
$
49

 
$
40

 
$
3

 
$
3

Interest costs
 
93

 
97

 
9

 
12

Expected return on plan assets
 
(125
)
 
(121
)
 
(8
)
 
(9
)
Amortization of prior service costs (credits)
 
3

 
3

 
(58
)
 
(51
)
Net periodic costs (credits)
 
$
20

 
$
19

 
$
(54
)
 
$
(45
)


Components of Net Periodic Benefit Costs (Credits)
 
Pensions
OPEB
For the Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
 
(In millions)
Service costs
 
$
98

 
$
80

 
$
6

 
$
6

Interest costs
 
186

 
194

 
18

 
24

Expected return on plan assets
 
(250
)
 
(242
)
 
(16
)
 
(18
)
Amortization of prior service costs (credits)
 
6

 
6

 
(107
)
 
(102
)
Net periodic costs (credits)
 
$
40

 
$
38

 
$
(99
)
 
$
(90
)
 
 
 
 
 
 
 
 
 
Net Periodic Pension and OPEB Costs
The net periodic pension and OPEB costs (net of amounts capitalized) recognized in earnings by FE and FES were as follows:

Net Periodic Benefit Expense (Credit)
 
Pensions
 
OPEB
For the Three Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
 
(In millions)
FirstEnergy
 
$
14

 
$
14

 
$
(34
)
 
$
(32
)
FES
 
5

 
5

 
(5
)
 
(4
)


Net Periodic Benefit Expense (Credit)
 
Pensions
 
OPEB
For the Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
 
(In millions)
FirstEnergy
 
$
25

 
$
27

 
$
(64
)
 
$
(62
)
FES
 
8

 
8

 
(8
)
 
(8
)