Segment Information (Details 2) (Unaudited) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Total operating income	$ 825	$ 723	$ 2,477	$ 2,152
Non-segment factors affecting operating income [Abstract]
Unallocated corporate expenses	(48)	(34)	(96)	(99)
Net pension adjustment	100	(1)	302	2
Royalty income adjustment	(4)	(2)	(11)	(8)
Aerospace Systems
Segment Reporting Information [Line Items]
Total operating income	304	303	936	934
Electronic Systems
Segment Reporting Information [Line Items]
Total operating income	293	261	814	751
Information Systems
Segment Reporting Information [Line Items]
Total operating income	187	190	570	578
Technical Services
Segment Reporting Information [Line Items]
Total operating income	55	56	160	157
Intersegment eliminations
Segment Reporting Information [Line Items]
Total operating income	(62)	(50)	(198)	(163)
Total segment operating income [Member]
Segment Reporting Information [Line Items]
Total operating income	$ 777	$ 760	$ 2,282	$ 2,257