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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Cost (Income)
Net periodic benefit cost (income) consisted of the following: 
 
For the Nine Months Ended September 30,
 
For the Three Months Ended September 30,
 
Pension
 
Postretirement
 
Pension
 
Postretirement
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Service cost
$
55

 
$
65

 
$
12

 
$
13

 
$
18

 
$
22

 
$
4

 
$
4

Interest cost
211

 
252

 
58

 
75

 
70

 
84

 
18

 
24

Expected return on plan assets
(416
)
 
(405
)
 
—

 
—

 
(139
)
 
(135
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
130

 
175

 
19

 
33

 
43

 
58

 
3

 
10

Prior service cost (credit)
4

 
6

 
(29
)
 
(30
)
 
2

 
2

 
(10
)
 
(10
)
Termination and curtailment
20

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net periodic benefit cost (income)
$
4

 
$
93

 
$
60

 
$
91

 
$
(6
)
 
$
31

 
$
15

 
$
28