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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit (Income) Cost
Net periodic benefit cost (income) consisted of the following: 
 
For the Six Months Ended June 30,
 
For the Three Months Ended June 30,
 
Pension
 
Postretirement
 
Pension
 
Postretirement
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
41

 
$
38

 
$
9

 
$
9

 
$
20

 
$
19

 
$
5

 
$
5

Interest cost
138

 
144

 
37

 
40

 
70

 
72

 
18

 
20

Expected return on
plan assets
(292
)
 
(300
)
 
(9
)
 
—

 
(146
)
 
(150
)
 
(4
)
 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
112

 
98

 
17

 
16

 
55

 
48

 
8

 
8

Prior service
cost (credit)
2

 
2

 
(21
)
 
(19
)
 
1

 
1

 
(11
)
 
(10
)
Net periodic benefit
cost (income)
$
1

 
$
(18
)
 
$
33

 
$
46

 
$
—

 
$
(10
)
 
$
16

 
$
23