Share Based Compensation (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Service Conditions [Member]
Share-Based Compensation Awards
Value of shares, options or units vested	$ 41	$ 31	$ 42
Intrinsic value of cash awards paid	23	13	1
Performance Vesting Conditions [Member]
Share-Based Compensation Awards
Value of shares, options or units vested	33	11	21
Intrinsic value of cash awards paid	1	5	10
Intrinsic value of amounts paid under DIP	$ 1	$ 9	$ 1