Segment Information (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012 Segments	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jan. 02, 2012 Missile Business [Member]	Sep. 30, 2011 Missile Business [Member]	Sep. 30, 2011 Missile Business [Member]	Sep. 30, 2012 Aerospace Systems	Sep. 30, 2011 Aerospace Systems	Sep. 30, 2012 Aerospace Systems	Sep. 30, 2011 Aerospace Systems	Sep. 30, 2012 Electronic Systems	Sep. 30, 2011 Electronic Systems	Sep. 30, 2012 Electronic Systems	Sep. 30, 2011 Electronic Systems	Sep. 30, 2012 Information Systems	Sep. 30, 2011 Information Systems	Sep. 30, 2012 Information Systems	Sep. 30, 2011 Information Systems	Sep. 30, 2012 Technical Services	Sep. 30, 2011 Technical Services	Sep. 30, 2012 Technical Services	Sep. 30, 2011 Technical Services	Sep. 30, 2012 Intersegment eliminations	Sep. 30, 2011 Intersegment eliminations	Sep. 30, 2012 Intersegment eliminations	Sep. 30, 2011 Intersegment eliminations	Sep. 30, 2012 Total segment operating income [Member]	Sep. 30, 2011 Total segment operating income [Member]	Sep. 30, 2012 Total segment operating income [Member]	Sep. 30, 2011 Total segment operating income [Member]
Segment Reporting Information [Line Items]
Number of operating segments	4
Sales	$ 6,270	$ 6,612	$ 18,742	$ 19,906	$ 51	$ 117	$ 379	$ 2,586	$ 2,455	$ 7,373	$ 7,521	$ 1,707	$ 1,905	$ 5,175	$ 5,504	$ 1,776	$ 1,955	$ 5,476	$ 6,011	$ 748	$ 796	$ 2,281	$ 2,403	$ (547)	$ (499)	$ (1,563)	$ (1,533)
Operating income	736	825	2,306	2,477		9	34	288	295	859	902	279	293	859	814	170	187	577	570	62	63	206	193	(69)	(61)	(200)	(197)	730	777	2,301	2,282
Change In cost of goods sold																									146		505
Unallocated corporate expenses	(27)	(48)	(89)	(96)
Net pension adjustment	34	100	101	302
Royalty income adjustment	$ (1)	$ (4)	$ (7)	$ (11)