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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit (Income) Cost
Net periodic benefit (income) cost consisted of the following: 
 
For the Nine Months Ended September 30,
 
For the Three Months Ended September 30,
 
Pension
 
Postretirement
 
Pension
 
Postretirement
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost
$
52

 
$
61

 
$
12

 
$
13

 
$
17

 
$
20

 
$
4

 
$
4

Interest cost
229

 
207

 
57

 
52

 
77

 
69

 
17

 
15

Expected return on plan assets
(431
)
 
(438
)
 
(11
)
 
(14
)
 
(143
)
 
(146
)
 
(4
)
 
(5
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
119

 
168

 
3

 
16

 
39

 
56

 
(3
)
 
(1
)
Prior service cost (credit)
4

 
3

 
(22
)
 
(31
)
 
1

 
1

 
(8
)
 
(10
)
Curtailment
7

 
—

 
5

 
—

 
—

 
—

 
—

 
—

Net periodic benefit (income) cost
$
(20
)
 
$
1

 
$
44

 
$
36

 
$
(9
)
 
$
—

 
$
6

 
$
3