Segment Information (Operating Business Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Business Segments Information
Net Sales	$ 1,973	$ 1,956
Operating earnings	216	232
Total other income (expense)	(11)	12
Earnings from continuing operations before income taxes	205	244
Government [Member]
Business Segments Information
Net Sales	1,346	1,301
Operating earnings	180	150
Enterprise [Member]
Business Segments Information
Net Sales	627	655
Operating earnings	$ 36	$ 82