Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	$ 2,084	$ 2,038	$ 2,006
Operating Income	258	258	231
Aerospace Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	171	134	133
Operating Income	20	18	13
Electronic Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	607	649	684
Operating Income	110	131	118
Information Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	682	687	623
Operating Income	78	68	61
Technical Services
Intersegment sales and operating income (Table Amounts) [Abstract]
Sales	624	568	566
Operating Income	$ 50	$ 41	$ 39