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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit (Income) Cost Net periodic benefit (income) cost consisted of the following: 
 
For the Three Months Ended March 31,
 
Pension
 
Postretirement
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost
$
17

 
$
21

 
$
4

 
$
4

Interest cost
77

 
68

 
20

 
19

Expected return on plan assets
(145
)
 
(146
)
 
(4
)
 
(5
)
Amortization:
 
 
 
 
 
 
 
Net loss
42

 
57

 
3

 
9

Prior service cost (credit)
1

 
1

 
(7
)
 
(10
)
Curtailment
7

 
—

 
5

 
—

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

 
$
21

 
$
17