Stock Compensation (Summary of Share-based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
Stock Compensation [Abstract]
Outstanding, beginning of period - Shares	24	26
Granted - Shares	6	5
Stock options exercised and other in shares	(2)	(6)
Forfeitures and expirations - Shares	(1)	(1)
Outstanding, end of period - Shares	27	24
Exercisable, end of period - Shares	17	16
Outstanding, beginning of period - Weighted-average exercise price	$ 48	$ 47
Granted - Weighted-average exercise price	$ 52	$ 53
Exercised - Weighted-average exercise price	$ 43	$ 45
Forfeitures and expirations - Weighted-average exercise price	$ 53	$ 52
Outstanding, end of period - Weighted-average exercise price	$ 49	$ 48
Exercisable, end of period - Weighted-average exercise price	$ 48	$ 46
Outstanding, end of period - Weighted-average remaining contractual term (years)	6 years 4 months 24 days	6 years 6 months
Exercisable, end of period - Weighted-average remaining contractual term (years)	5 years 1 month 6 days	5 years 2 months 12 days
Outstanding, end of period - Aggregate intrinsic value	$ 78	$ 121
Exercisable, end of period - Aggregate intrinsic value	$ 78	$ 108
Weighted-average fair value of options granted	$ 5.23	$ 7.59