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Pension and Other Postemployment Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30,
 
2018
 
2017
 
2018
 
2017
 
 
(In millions)
Service costs
 
$
56

 
$
52

 
$
1

 
$
1

Interest costs
 
93

 
97

 
6

 
7

Expected return on plan assets
 
(144
)
 
(112
)
 
(7
)
 
(7
)
Amortization of prior service costs (credits)
 
2

 
2

 
(20
)
 
(20
)
Special termination costs
 
21

 
—

 
6

 
—

Net periodic costs (credits), including amounts capitalized
 
$
28

 
$
39

 
$
(14
)
 
$
(19
)
Net periodic costs (credits), recognized in earnings
 
$
5

 
$
30

 
$
(15
)
 
$
(14
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Components of Net Periodic Benefit Costs (Credits)
 
Pension
OPEB
For the Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
 
(In millions)
Service costs
 
$
168

 
$
156

 
$
3

 
$
3

Interest costs
 
279

 
291

 
18

 
21

Expected return on plan assets
 
(432
)
 
(336
)
 
(22
)
 
(22
)
Amortization of prior service costs (credits)
 
6

 
6

 
(60
)
 
(60
)
Special termination costs
 
21

 
—

 
6

 
—

Net periodic costs (credits), including amounts capitalized
 
$
42

 
$
117

 
$
(55
)
 
$
(58
)
Net periodic costs (credits), recognized in earnings
 
$
(27
)
 
$
89

 
$
(57
)
 
$
(43
)