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Pension and Other Postemployment Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The components of the consolidated net periodic costs (credits) for pension and OPEB were as follows:
Components of Net Periodic Benefit Costs (Credits)
 
Pension
OPEB
For the Three Months Ended March 31,
 
2019
 
2018
 
2019
 
2018
 
 
(In millions)
Service costs (1)
 
$
48

 
$
56

 
$
1

 
$
1

Interest costs (2)
 
93

 
93

 
5

 
6

Expected return on plan assets (2)
 
(135
)
 
(144
)
 
(7
)
 
(8
)
Amortization of prior service costs (credits) (2)
 
2

 
2

 
(9
)
 
(20
)
Special termination costs (2)
 
15

 
—

 
—

 
—

Net periodic costs (credits), including amounts capitalized
 
$
23

 
$
7

 
$
(10
)
 
$
(21
)
Net periodic costs (credits), recognized in earnings
 
$
6

 
$
(14
)
 
$
(10
)
 
$
(21
)
 
 
 
 
 
 
 
 
 

(1) Service costs, net of capitalization, are reported within Other operating expenses on FirstEnergy's Consolidated Statements of Income.
(2) Non-service costs are reported within Miscellaneous income, net, within Other Income (Expense) on FirstEnergy's Consolidated Statements of Income.