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Costs and Estimated Earnings on Uncompleted Contracts (Tables)
 12 Months Ended
Dec. 31, 2017
Text Block [Abstract]  
Costs and Estimated Earnings on Uncompleted Contracts

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

 

     December 31,  
     2017      2016  

Costs incurred on uncompleted contracts

    $ 6,395      $ 8,132  

Estimated earnings

      3,023        3,869  
  

 

 

     

 

 

  
     9,418        12,001  

Less: Billings to date on uncompleted contracts

      9,202        11,776  
  

 

 

     

 

 

  
   $ 216      $ 225  
  

 

 

     

 

 

  

Costs and estimated earnings in excess of billings on uncompleted contracts

    $ 495      $ 665  

Billings in excess of costs and estimated earnings on uncompleted contracts

      (279 )       (440 ) 
  

 

 

     

 

 

  
   $ 216      $ 225