Employees' Stock Incentive Plans and Management Incentive Plans (Compensation Costs Related to Equity Plans) (Details) - Stock option and restricted stock units - Selling, general and administrative expenses - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax compensation cost	$ 3	$ 2	$ 5	$ 4
Tax benefit	1	1	2	1
After-tax compensation cost	$ 2	$ 1	$ 3	$ 3