Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Total Operating Income	$ 799	$ 825	$ 841	$ 811	$ 675	$ 723	$ 749	$ 680	$ 3,276	$ 2,827	$ 2,274
Non-segment factors affecting operating income [Abstract]
Unallocated corporate expenses									(166)	(182)	(100)
Net pension adjustment									400	10	(237)
Royalty income adjustment									(13)	(11)	(24)
Aerospace Systems
Segment Reporting Information [Line Items]
Total Operating Income									1,261	1,256	1,071
Electronic Systems
Segment Reporting Information [Line Items]
Total Operating Income									1,070	1,023	969
Information Systems
Segment Reporting Information [Line Items]
Total Operating Income									766	756	624
Technical Services
Segment Reporting Information [Line Items]
Total Operating Income									216	206	161
Intersegment eliminations
Segment Reporting Information [Line Items]
Total Operating Income									(258)	(231)	(190)
Total segment operating income
Segment Reporting Information [Line Items]
Total Operating Income									$ 3,055	$ 3,010	$ 2,635