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Inventories and Contracts in Progress (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(Dollars in millions)
June 30, 2017
 
December 31, 2016
Raw materials
$
2,146

 
$
2,040

Work-in-process
3,253

 
2,787

Finished goods
3,753

 
3,305

Contracts in progress
9,814

 
9,395

 
18,966

 
17,527

Less:
 
 
 
Progress payments, secured by lien, on U.S. Government contracts
(175
)
 
(130
)
Billings on contracts in progress
(8,931
)
 
(8,693
)
 
$
9,860

 
$
8,704