Share-Based Compensation (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Restricted Stock Units
Share-Based Compensation Awards
Value of shares, options or units vested	$ 21	$ 30
Cash paid	18	21
Performance Share Units
Share-Based Compensation Awards
Cash paid	$ 11	$ 51