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Pension and Other Postemployment Benefits (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
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

 
(50
)
 
(51
)
Net periodic costs (credits)
 
$
20

 
$
19

 
$
(46
)
 
$
(45
)
Net Periodic Pension and OPEB Costs
The net periodic pension and OPEB costs (net of amounts capitalized) recognized in earnings by FE and its subsidiaries were as follows:

Net Periodic Benefit Expense (Credit)
 
Pensions
 
OPEB
For the Three Months Ended March 31,
 
2013
 
2012
 
2013
 
2012
 
 
(In millions)
FirstEnergy
 
$
11

 
$
13

 
$
(30
)
 
$
(30
)
FES
 
3

 
3

 
(3
)
 
(4
)