Stock Compensation (Summary of Share-based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Stock Compensation [Abstract]
Outstanding, beginning of period - Shares	25	24
Granted - Shares	6	6
Stock options exercised and other in shares	(5)	(1)
Forfeitures and expirations - Shares	0	(1)
Outstanding, end of period - Shares	26	28
Exercisable, end of period - Shares	13	18
Outstanding, beginning of period - Weighted-average exercise price	$ 50	$ 48
Granted - Weighted-average exercise price	$ 60	$ 53
Exercised - Weighted-average exercise price	$ 47	$ 42
Forfeitures and expirations - Weighted-average exercise price	$ 0	$ 53
Outstanding, end of period - Weighted-average exercise price	$ 53	$ 49
Exercisable, end of period - Weighted-average exercise price	$ 50	$ 47
Outstanding, end of period - Weighted-average remaining contractual term (years)	7 years 6 months 0 days	6 years 10 months 24 days
Exercisable, end of period - Weighted-average remaining contractual term (years)	5 years 10 months 24 days	5 years 6 months 0 days
Outstanding, end of period - Aggregate intrinsic value	$ 271	$ 123
Exercisable, end of period - Aggregate intrinsic value	$ 187	$ 115
Weighted-average fair value of options granted	$ 5.92	$ 5.23