Goodwill (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Goodwill
Accumulated goodwill impairment losses	$ 2,755	$ 2,755
Ingalls
Goodwill
Accumulated goodwill impairment losses	1,568	1,568
Newport News
Goodwill
Accumulated goodwill impairment losses	$ 1,187	$ 1,187

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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