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Pension and Other Postemployment Benefits
 3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
PENSIONS AND OTHER POSTEMPLOYMENT BENEFITS
PENSIONS AND OTHER POSTEMPLOYMENT BENEFITS

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
)


Pension and OPEB obligations are allocated to FE's subsidiaries employing the plan participants. 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
)