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Inventories and Contracts in Progress (Tables)
 3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(Dollars in millions)
March 31, 2016
 
December 31, 2015
Raw materials
$
2,218

 
$
2,037

Work-in-process
2,639

 
2,422

Finished goods
3,058

 
3,183

Contracts in progress
8,900

 
8,668

 
16,815

 
16,310

Less:
 
 
 
Progress payments, secured by lien, on U.S. Government contracts
(148
)
 
(239
)
Billings on contracts in progress
(8,160
)
 
(7,936
)
 
$
8,507

 
$
8,135