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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Net Periodic Benefit Cost (Credit)
The components of net periodic benefit cost are as follows:

Net periodic benefit cost (credit)
Quarter ended
 
March 31, 2013
 
March 31, 2012
(in millions)
Domestic pension benefits

 
Foreign pension benefits

 
Health care benefits

 
Domestic pension benefits

 
Foreign pension benefits

 
Health care benefits

Service cost
$
16

 
$
9

 
$
1

 
$
15

 
$
8

 
$
1

Interest cost
43

 
10

 
2

 
42

 
9

 
3

Expected return on assets
(73
)
 
(12
)
 
(2
)
 
(68
)
 
(12
)
 
(2
)
Other
47

 
4

 
1

 
38

 
3

 
3

Net periodic benefit cost
$
33

 
$
11

 
$
2

 
$
27

 
$
8

 
$
5