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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2020
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
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
(in millions)
Service cost
$
37

 
$
35

 
$
8

 
$
8

 
$
18

 
$
18

 
$
4

 
$
4

Interest cost
126

 
152

 
30

 
40

 
63

 
75

 
15

 
20

Expected return on plan assets
(251
)
 
(288
)
 
(7
)
 
(7
)
 
(125
)
 
(143
)
 
(4
)
 
(3
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
53

 
80

 
7

 
6

 
26

 
38

 
4

 
3

Prior service cost (credit)
2

 
3

 
(15
)
 
(14
)
 
1

 
2

 
(8
)
 
(7
)
Curtailment
—

 
7

 
—

 
5

 
—

 
—

 
—

 
—

Net periodic benefit
(income) cost
$
(33
)
 
$
(11
)
 
$
23

 
$
38

 
$
(17
)
 
$
(10
)
 
$
11

 
$
17