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Pension Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2015
 
2014
 
U.S.
 
Foreign
 
U.S.
 
Foreign
 
(in millions)
Service cost
$
4

 
$
4

 
$
3

 
$
4

Interest cost
12

 
102

 
12

 
122

Expected return on plan assets
(17
)
 
(72
)
 
(16
)
 
(90
)
Amortization of prior service cost
2

 
—

 
2

 
1

Amortization of net loss
5

 
8

 
3

 
8

Total pension cost
$
6

 
$
42

 
$
4

 
$
45