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Inventories
 6 Months Ended
Jul. 01, 2011
Inventories [Abstract]  
Inventories
 
6.  Inventories
 
Inventories at Lower of Cost or Market. The table below presents the components of inventories at cost (first-in, first-out or average cost), but not in excess of realizable value.
 
                 
    July 1,
 		    December 31,
 		 
    2011     2010  
    (in millions)  
 
Raw materials, components and sub-assemblies
  $  136     $  114  
Work in process
    158       130  
Finished goods
    58       59  
                 
Total
  $ 352     $ 303