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Inventoried Costs, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventoried Costs
Inventoried costs, net consisted of the following:
 
 
December 31
$ in millions
 
2018
 
2017
Production costs of contracts in process
 
$
402

 
$
312

G&A expenses
 
16

 
30

 
 
418

 
342

Progress and performance-based payments received
 
(41
)
 
(41
)
 
 
377

 
301

Product inventory and raw material
 
277

 
97

Inventoried costs, net
 
$
654

 
$
398