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Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Cost (Income)
Net periodic benefit (income) cost consisted of the following: 
 
For the Three Months Ended March 31,
 
Pension
 
Postretirement
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Service cost
$
19

 
$
18

 
$
4

 
$
4

Interest cost
72

 
71

 
20

 
21

Expected return on plan assets
(150
)
 
(138
)
 

 

Amortization:
 
 
 
 
 
 
 
Net loss
50

 
44

 
8

 
7

Prior service cost (credit)
1

 
1

 
(9
)
 
(10
)
Termination and curtailment

 
20

 

 

Net periodic benefit (income) cost
$
(8
)
 
$
16

 
$
23

 
$
22