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Inventories and Contracts in Progress (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventory Table [Table Text Block]
(dollars in millions)
2017
 
2016
Raw materials
$
2,038

 
$
2,040

Work-in-process
3,366

 
2,787

Finished goods
3,845

 
3,305

Contracts in progress
10,205

 
9,395

 
19,454

 
17,527

Less:
 
 
 
Progress payments, secured by lien, on U.S. Government contracts
(236
)
 
(130
)
Billings on contracts in progress
(9,337
)
 
(8,693
)
 
$
9,881

 
$
8,704