Change in Carrying Amount of Goodwill (Table) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill beginning balance	$ 1,234	$ 956
Goodwill, Acquired During Period		278
Adjustments	(17)
Goodwill impairment			$ (75)
Goodwill ending balance	1,217	1,234	956
Ingalls [Member]
Goodwill [Roll Forward]
Goodwill beginning balance	175	175
Goodwill ending balance	175	175	175
Newport News Shipbuilding [Member]
Goodwill [Roll Forward]
Goodwill beginning balance	721	721
Goodwill ending balance	721	721	721
Technical Solutions [Member]
Goodwill [Roll Forward]
Goodwill beginning balance	338	60
Goodwill, Acquired During Period		278
Adjustments	(17)
Goodwill impairment			(75)
Goodwill ending balance	$ 321	$ 338	$ 60