Segment Information (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	$ 2,038	$ 2,005	$ 1,752
Total operating income (loss)	258	231	190
Aerospace Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	134	132	121
Total operating income (loss)	18	13	13
Electronic Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	649	684	650
Total operating income (loss)	131	118	103
Information Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	687	623	474
Total operating income (loss)	68	61	44
Technical Services
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	568	566	507
Total operating income (loss)	$ 41	$ 39	$ 30