Inventoried Costs, Net (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Production costs of contracts in process	$ 1,574	$ 1,218
General and administrative expenses	249	293
Inventoried costs	1,823	1,511
Progress and performance-based payments received	(1,107)	(807)
Inventoried costs, net of progress payments	716	704
Product inventory	100	103
Inventory, Net	$ 816	$ 807