Segment Information (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended
	Jan. 02, 2012	Jun. 30, 2012 Segments	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Number of Operating Segments		4
Goodwill Transferred	$ 51
Sales		6,274	6,560	12,472	13,294
Operating income		774	841	1,570	1,652
Unallocated corporate expenses		(39)	(38)	(62)	(48)
Net pension adjustment		35	99	67	202
Royalty income adjustment		(4)	(4)	(6)	(7)
Missile Business [Member]
Segment Reporting Information [Line Items]
Sales			119		262
Operating income			11		25
Aerospace Systems
Segment Reporting Information [Line Items]
Sales		2,404	2,473	4,787	5,066
Operating income		292	320	571	607
Electronic Systems
Segment Reporting Information [Line Items]
Sales		1,744	1,791	3,468	3,599
Operating income		276	284	580	521
Information Systems
Segment Reporting Information [Line Items]
Sales		1,856	2,031	3,700	4,056
Operating income		202	189	407	383
Technical Services
Segment Reporting Information [Line Items]
Sales		783	776	1,533	1,607
Operating income		74	62	144	130
Intersegment eliminations
Segment Reporting Information [Line Items]
Sales		(513)	(511)	(1,016)	(1,034)
Operating income		(62)	(71)	(131)	(136)
Change In Cost Of Goods Sold			198		359
Total segment operating income [Member]
Segment Reporting Information [Line Items]
Operating income		$ 782	$ 784	$ 1,571	$ 1,505