Inventoried Costs, Net (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventoried Costs

Inventoried costs consisted of the following:

	December 31
$ in millions	2017			2016
Production costs of contracts in process	$	1,813		$	1,574
G&A expenses	266			249
Contracts in process, gross	2,079			1,823
Progress and performance-based payments received	(1,396		)	(1,107		)
Contracts in process, net	683			716
Product inventory and raw material	97			100
Total inventoried costs, net	$	780		$	816