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Inventories
3 Months Ended
Mar. 31, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
(in millions)
March 31,
2013
 
December 31,
2012
Finished goods
$
184

 
$
182

Work in process
34

 
30

Raw materials
243

 
231

Total inventories, net
$
461

 
$
443