Goodwill and Other Purchased Intangible Assets (Details) (USD $)	12 Months Ended						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Aerospace Systems	Dec. 31, 2011 Aerospace Systems	Jan. 02, 2012 Aerospace Systems	Dec. 31, 2012 Electronic Systems	Dec. 31, 2011 Electronic Systems	Dec. 31, 2012 Information Systems	Dec. 31, 2011 Information Systems	Dec. 31, 2012 Technical Services	Dec. 31, 2011 Technical Services
Goodwill Impairment (Amounts in Paragraph)
Accumulated goodwill impairment losses				$ 570,000,000	$ 570,000,000
Goodwill (Table Amounts)
Beginning balance	12,374,000,000	12,376,000,000		3,801,000,000	3,801,000,000	51,000,000	2,400,000,000	2,402,000,000	5,248,000,000	5,248,000,000	925,000,000	925,000,000
Businesses acquired, sold and other	57,000,000	(2,000,000)		(43,000,000)	0		10,000,000	(2,000,000)	39,000,000	0	51,000,000	0
Ending balance	12,431,000,000	12,374,000,000	12,376,000,000	3,758,000,000	3,801,000,000	51,000,000	2,410,000,000	2,400,000,000	5,287,000,000	5,248,000,000	976,000,000	925,000,000
Additional disclosure on Goodwill and Other Intangible Assets (Amounts in Paragraphs)
Gross contract, program and other intangible assets	1,800,000,000	1,800,000,000
Gross contract, program and other intangible assets, accumulated amortization	1,700,000,000	1,700,000,000
Net contract, program and other intangible assets	137,000,000	155,000,000
Aggregate amortization expense	36,000,000	37,000,000	71,000,000
Weighted-average useful life for purchased intangible assets	17 years
Expected amortization for purchased intangibles in 2013	30,000,000
Expected amortization for purchased intangibles in 2014	18,000,000
Expected amortization for purchased intangibles in 2015	17,000,000
Expected amortization for purchased intangibles in 2016	11,000,000
Expected amortization for purchased intangibles in 2017	$ 10,000,000