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Costs and Estimated Earnings on Uncompleted Contracts (Tables)
 12 Months Ended
Dec. 31, 2016
Text Block [Abstract]  
Costs and Estimated Earnings on Uncompleted Contracts

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

 

     December 31,  
     2016      2015  

Costs incurred on uncompleted contracts

    $ 8,132       $ 9,082   

Estimated earnings

      3,869         4,080   
  

 

 

     

 

 

  
     12,001         13,162   

Less: Billings to date on uncompleted contracts

      11,776         12,697   
  

 

 

     

 

 

  
   $ 225       $ 465   
  

 

 

     

 

 

  

Costs and estimated earnings in excess of billings on uncompleted contracts

    $ 665       $ 1,250   

Billings in excess of costs and estimated earnings on uncompleted contracts

      (440 )       (785 ) 
  

 

 

     

 

 

  
   $ 225       $ 465