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Inventories and Contracts in Progress (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(dollars in millions)
June 30, 2018
 
December 31, 2017
Raw materials
$
2,298

 
$
2,038

Work-in-process
2,306

 
3,366

Finished goods
4,375

 
3,845

Contracts in progress
—

 
10,205

 
8,979

 
19,454

Less:
 
 
 
Progress payments, secured by lien, on U.S. Government contracts
—

 
(236
)
Billings on contracts in progress
—

 
(9,337
)
 
$
8,979

 
$
9,881