Stock Compensation (Summary of Share-based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Stock Compensation [Abstract]
Outstanding, beginning of period - Shares	25	24
Granted - Shares	6	6
Stock options exercised and other in shares	(9)	(1)
Forfeitures and expirations - Shares	(1)	(1)
Outstanding, end of period - Shares	21	28
Exercisable, end of period - Shares	10	18
Outstanding, beginning of period - Weighted-average exercise price	$ 50	$ 48
Granted - Weighted-average exercise price	$ 60	$ 53
Exercised - Weighted-average exercise price	$ 48	$ 42
Forfeitures and expirations - Weighted-average exercise price	$ 54	$ 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 4 months 24 days	6 years 7 months 6 days
Exercisable, end of period - Weighted-average remaining contractual term (years)	5 years 9 months 18 days	5 years 3 months 18 days
Outstanding, end of period - Aggregate intrinsic value	$ 231	$ 58
Exercisable, end of period - Aggregate intrinsic value	$ 150	$ 58
Weighted-average fair value of options granted	$ 5.92	$ 5.23