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Inventoried Costs, Net
12 Months Ended
Dec. 31, 2010
INVENTORIED COSTS, NET [Abstract]  
9. INVENTORIED COSTS, NET
 
9.   INVENTORIED COSTS, NET
 
Inventoried costs consisted of the following:
 
                 
    December 31
$ in millions   2010   2009
Production costs of contracts in process
  $ 1,521     $ 1,648  
General and administrative expenses
    190       160  
 
      1,711       1,808  
Progress payments received
    (962 )     (1,098 )
 
      749       710  
Product inventory
    147       164  
 
Total inventoried costs, net
  $ 896     $ 874