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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit (Income) Cost
Net periodic benefit (income) cost consisted of the following: 
 
For the Six Months Ended June 30,
 
For the Three Months Ended June 30,
 
Pension
 
Postretirement
 
Pension
 
Postretirement
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost
$
35

 
$
41

 
$
8

 
$
9

 
$
18

 
$
20

 
$
4

 
$
5

Interest cost
152

 
138

 
40

 
37

 
75

 
70

 
20

 
18

Expected return on plan assets
(288
)
 
(292
)
 
(7
)
 
(9
)
 
(143
)
 
(146
)
 
(3
)
 
(4
)
Amortization:
 
 
 
 
 
 
 
 

 
 
 
 
 
 
Net loss
80

 
112

 
6

 
17

 
38

 
55

 
3

 
8

Prior service cost (credit)
3

 
2

 
(14
)
 
(21
)
 
2

 
1

 
(7
)
 
(11
)
Curtailment
7

 
—

 
5

 
—

 
—

 
—

 
—

 
—

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

 
$
38

 
$
33

 
$
(10
)
 
$
—

 
$
17

 
$
16