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

 
$
4

 
$
4

 
$
4

 
$
8

 
$
8

 
$
7

 
$
8

Interest cost
11

 
95

 
12

 
129

 
23

 
197

 
24

 
251

Expected return on plan assets
(17
)
 
(66
)
 
(16
)
 
(96
)
 
(34
)
 
(138
)
 
(32
)
 
(186
)
Amortization of prior service cost
2

 
—

 
1

 
1

 
4

 
—

 
3

 
2

Amortization of net loss
5

 
7

 
3

 
9

 
10

 
15

 
6

 
17

Total pension cost
$
5

 
$
40

 
$
4

 
$
47

 
$
11

 
$
82

 
$
8

 
$
92