Segment Information (Details 2) (Unaudited) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting Information [Line Items]
Total Operating Income	$ 841	$ 750	$ 1,652	$ 1,429
Non-segment factors affecting operating income [Abstract]
Unallocated expense	(38)	(40)	(48)	(65)
Net pension adjustment	99	1	202	3
Royalty income adjustment	(4)	(2)	(7)	(6)
Aerospace Systems
Segment Reporting Information [Line Items]
Total Operating Income	331	335	632	631
Electronic Systems
Segment Reporting Information [Line Items]
Total Operating Income	284	264	521	490
Information Systems
Segment Reporting Information [Line Items]
Total Operating Income	189	205	383	388
Technical Services
Segment Reporting Information [Line Items]
Total Operating Income	51	52	105	101
Intersegment eliminations
Segment Reporting Information [Line Items]
Total Operating Income	(71)	(65)	(136)	(113)
Total segment operating income [Member]
Segment Reporting Information [Line Items]
Total Operating Income	$ 784	$ 791	$ 1,505	$ 1,497