Share - Based Compensation (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Service Conditions [Member]
Share-Based Compensation Awards
Value of awards vested	$ 30	$ 34
Intrinsic value of cash awards paid	21	20
Performance Conditions [Member]
Share-Based Compensation Awards
Intrinsic value of cash awards paid	$ 51	$ 1