Segment Information (Operating Business Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Business Segments Information
Net Sales	$ 2,153	$ 2,085	$ 6,257	$ 5,903
Operating earnings	324	254	833	582
Total other income (expense)	0	(16)	(25)	(111)
Earnings from continuing operations before income taxes	324	238	808	471
Government [Member]
Business Segments Information
Net Sales	1,521	1,360	4,281	3,811
Operating earnings	273	186	620	390
Enterprise [Member]
Business Segments Information
Net Sales	632	725	1,976	2,092
Operating earnings	$ 51	$ 68	$ 213	$ 192