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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit (Income) Cost
Net periodic benefit cost (income) consisted of the following: 
 
For the Three Months Ended March 31,
 
Pension
 
Postretirement
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
21

 
$
19

 
$
4

 
$
4

Interest cost
68

 
72

 
19

 
20

Expected return on plan assets
(146
)
 
(150
)
 
(5
)
 
—

Amortization:
 
 
 
 
 
 
 
Net loss
57

 
50

 
9

 
8

Prior service cost (credit)
1

 
1

 
(10
)
 
(9
)
Net periodic benefit cost (income)
$
1

 
$
(8
)
 
$
17

 
$
23