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Pension Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost Table
Total pension cost for the periods indicated includes the following components (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
U.S.
 
Foreign
 
U.S.
 
Foreign
 
U.S.
 
Foreign
 
U.S.
 
Foreign
Service cost
$
4

 
$
4

 
$
3

 
$
5

 
$
12

 
$
12

 
$
10

 
$
13

Interest cost
12

 
84

 
12

 
126

 
35

 
281

 
36

 
377

Expected return on plan assets
(17
)
 
(59
)
 
(17
)
 
(93
)
 
(51
)
 
(197
)
 
(49
)
 
(279
)
Amortization of prior service cost
1

 
—

 
2

 
—

 
5

 
—

 
5

 
2

Amortization of net loss
5

 
6

 
4

 
9

 
15

 
21

 
10

 
26

Total pension cost
$
5

 
$
35

 
$
4

 
$
47

 
$
16

 
$
117

 
$
12

 
$
139