Goodwill and Identifiable Intangible Assets (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y Employee	Dec. 31, 2010	Dec. 31, 2009	Nov. 30, 2011
Goodwill
Beginning balance	$ 8,730	$ 8,190
Business acquisitions	27	530
Impairment loss	(43)
Sale of a business		(2)
Foreign currency translation adjustment	(17)	12
Ending balance	8,697	8,730	8,190
Identifiable Intangible Assets
Weighted Average Amortization Period (in years)	21
Gross Carrying Amount	762	757
Accumulated Amortization	352	287
Net Carrying Amount	410	470
Amortization expense
Amortization expense	65	59	52
Estimated amortization expense
Estimated amortization expense, 2012	54
Estimated amortization expense, 2013	43
Estimated amortization expense, 2014	44
Estimated amortization expense, 2015	39
Estimated amortization expense, 2016	31
Goodwill and Identifiable Intangible Assets (Textual)
Approximate number of employees	61,000
Total goodwill related to business acquisitions	27	530
Goodwill related to business acquisitions during current year	19
Goodwill related to earn-outs from certain business acquisitions	3
Goodwill related to final purchase price allocation adjustments	5
Decrease in goodwill due to sale of business		(2)
Amount of goodwill not recoverable				105
Goodwill impairment charge	43
Goodwill impairment charge after income taxes	42
Goodwill impairment charge per share	$ 0.40
Accumulated goodwill impairment losses	58	15
Customer contractual relationships [Member]
Identifiable Intangible Assets
Weighted Average Amortization Period (in years)	23
Gross Carrying Amount	584	584
Accumulated Amortization	252	205
Net Carrying Amount	332	379
Technology [Member]
Identifiable Intangible Assets
Weighted Average Amortization Period (in years)	11
Gross Carrying Amount	149	145
Accumulated Amortization	87	72
Net Carrying Amount	62	73
Other [Member]
Identifiable Intangible Assets
Weighted Average Amortization Period (in years)	15
Gross Carrying Amount	29	28
Accumulated Amortization	13	10
Net Carrying Amount	16	18
C3ISR [Member]
Goodwill
Beginning balance	868	870
Business acquisitions	3
Foreign currency translation adjustment		(2)
Segment reclassification	(5)
Ending balance	866	868
Goodwill and Identifiable Intangible Assets (Textual)
Total goodwill related to business acquisitions	3
Government Services [Member]
Goodwill
Beginning balance	2,285	2,320
Foreign currency translation adjustment		(1)
Segment reclassification	(94)	(34)
Ending balance	2,191	2,285
AM&M [Member]
Goodwill
Beginning balance	1,172	1,158
Business acquisitions	2
Foreign currency translation adjustment	(5)	14
Ending balance	1,169	1,172
Goodwill and Identifiable Intangible Assets (Textual)
Total goodwill related to business acquisitions	2
Electronic Systems [Member]
Goodwill
Beginning balance	4,405	3,842
Business acquisitions	22	530
Impairment loss	(43)
Sale of a business		(2)
Foreign currency translation adjustment	(12)	1
Segment reclassification	99	34
Ending balance	4,471	4,405
Goodwill and Identifiable Intangible Assets (Textual)
Total goodwill related to business acquisitions	22	530
Decrease in goodwill due to sale of business		(2)
Goodwill impairment charge	$ 43