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Costs and Estimated Earnings on Uncompleted Contracts (Tables)
 12 Months Ended
Dec. 31, 2012
Costs and Estimated Earnings on Uncompleted Contracts

Costs and estimated earnings on uncompleted contracts consist of (in millions):

 

     December 31,  
     2012     2011  

Costs incurred on uncompleted contracts

    $ 5,731      $ 5,839   

Estimated earnings

      3,160        3,775   
  

 

 

    

 

 

  
     8,891        9,614   

Less: Billings to date

      8,855        9,886   
  

 

 

    

 

 

  
   $ 36      $ (272 ) 
  

 

 

    

 

 

  

Costs and estimated earnings in excess of billings on uncompleted contracts

    $ 1,225      $ 593   

Billings in excess of costs and estimated earnings on uncompleted contracts

      (1,189 )      (865 ) 
  

 

 

    

 

 

  
   $ 36      $ (272 )