Stock Compensation (Summary of Share-based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Stock Compensation [Abstract]
Outstanding, beginning of period - Shares	26	26	26
Granted - Shares	5	4	4
Exercised - shares	(6)	(4)	(3)
Forfeitures and expirations - Shares	(1)	0	(1)
Outstanding, end of period - Shares	24	26	26
Exercisable, end of period - Shares	16	20	22
Outstanding, beginning of period - Weighted-average exercise price	$ 47	$ 45	$ 45
Granted - Weighted-average exercise price	$ 53	$ 53	$ 40
Exercised - Weighted-average exercise price	$ 45	$ 43	$ 41
Forfeitures and expirations - Weighted-average exercise price	$ 52	$ 0	$ 48
Outstanding, end of period - Weighted-average exercise price	$ 48	$ 47	$ 45
Exercisable, end of period - Weighted-average exercise price	$ 47	$ 46	$ 45
Outstanding, end of period - Weighted-average remaining contractual term (years)	6.2
Exercisable, end of period - Weighted-average remaining contractual term (years)	5.0
Outstanding, end of period - Aggregate intrinsic value	$ 80
Exercisable, end of period - Aggregate intrinsic value	69
Total intrinsic value of options exercised	$ 63	$ 45	$ 25