Stock Compensation (Summary of Share-based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Stock Compensation [Abstract]
Outstanding, beginning of period - Shares	24	26	26
Granted - Shares	6	5	4
Exercised - shares	(4)	(6)	(4)
Forfeitures and expirations - Shares	(1)	(1)	0
Outstanding, end of period - Shares	25	24	26
Exercisable, end of period - Shares	14	16	20
Outstanding, beginning of period - Weighted-average exercise price	$ 48	$ 47	$ 45
Granted - Weighted-average exercise price	$ 52	$ 53	$ 53
Exercised - Weighted-average exercise price	$ 44	$ 45	$ 43
Forfeitures and expirations - Weighted-average exercise price	$ 53	$ 52	$ 0
Outstanding, end of period - Weighted-average exercise price	$ 50	$ 48	$ 47
Exercisable, end of period - Weighted-average exercise price	$ 48	$ 47	$ 46
Outstanding, end of period - Weighted-average remaining contractual term (years)	6 years 4 months 24 days
Exercisable, end of period - Weighted-average remaining contractual term (years)	5 years
Outstanding, end of period - Aggregate intrinsic value	$ 131
Exercisable, end of period - Aggregate intrinsic value	107
Total intrinsic value of options exercised	$ 34	$ 63	$ 45