Acquisitions (Integration Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2016	Apr. 03, 2015
Business Acquisition [Line Items]
Total acquisition and integration costs	$ 9	$ 0
Lockheed Martin Merger
Business Acquisition [Line Items]
Strategic acquisition and integration advisory services	3
Legal and accounting services	5
Other integration costs	1
Total acquisition and integration costs	$ 9