Goodwill and Other Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended							3 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2011 Year	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Contract and Program Intangibles	Dec. 31, 2010 Contract and Program Intangibles	Dec. 31, 2011 Other Purchased Intangibles	Dec. 31, 2010 Other Purchased Intangibles	Mar. 31, 2009 Aerospace Systems	Dec. 31, 2011 Aerospace Systems	Dec. 31, 2010 Aerospace Systems	Dec. 31, 2011 Electronic Systems	Dec. 31, 2011 Information Systems	Dec. 31, 2010 Information Systems	Dec. 31, 2009 Technical Services	Dec. 31, 2011 Technical Services	Dec. 31, 2010 Technical Services
Goodwill (Table Amounts)
Balance as of December 31, 2009 and 2010	$ 12,376								$ 3,801	$ 3,801	$ 2,402	$ 5,248	$ 5,248		$ 925	$ 925
Goodwill related to businesses sold	(2)										(2)
Balance as of December 31, 2011	12,374	12,376							3,801	3,801	2,400	5,248	5,248		925	925
Goodwill Impairment (Amounts in Paragraph)
Accumulated goodwill impairment losses									570	570
Goodwill reallocated among sectors								41						123
Purchased Intangible Assets (Table Amounts) [Abstract]
Gross carrying amount	1,805	1,805		1,705	1,705	100	100
Accumulated amortization	(1,650)	(1,613)		(1,567)	(1,531)	(83)	(82)
Net carrying amount	155	192		138	174	17	18
Additional disclosure on Goodwill and Other Intangible Assets (Amounts in Paragraphs)
Expected amortization for purchased intangibles in 2012	36
Expected amortization for purchased intangibles in 2013	29
Expected amortization for purchased intangibles in 2014	16
Expected amortization for purchased intangibles in 2015	15
Expected amortization for purchased intangibles in 2016	11
Weighted-average useful life for purchased intangible assets	17
Aggregate amortization expense	$ 37	$ 71	$ 74