Share-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2014		Mar. 29, 2013
Share-based Compensation [Abstract]
Share-Based Compensation (Expense) / Benefit (a)	$ (5)	[1]	$ 3	[1]
Income Tax Benefit / (Expense)	$ 2		$ (1)

[1] Share-based compensation was a benefit in first quarter 2013 driven by a reduction in the expected payouts on long-term incentive compensation.