Stock Compensation (Summary of Share-based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Stock Compensation [Abstract]
Outstanding, beginning of period - Shares	20	25
Granted - Shares	6	6
Stock options exercised and other in shares	(2)	(9)
Forfeitures and expirations - Shares	(1)	(1)
Outstanding, end of period - Shares	23	21
Exercisable, end of period - Shares	11	10
Outstanding, beginning of period - Weighted-average exercise price	$ 54	$ 50
Granted - Weighted-average exercise price	$ 60	$ 60
Exercised - Weighted-average exercise price	$ 50	$ 48
Forfeitures and expirations - Weighted-average exercise price	$ 57	$ 54
Outstanding, end of period - Weighted-average exercise price	$ 55	$ 53
Exercisable, end of period - Weighted-average exercise price	$ 52	$ 50
Outstanding, end of period - Weighted-average remaining contractual term (years)	7 years 6 months	7 years 4 months 24 days
Exercisable, end of period - Weighted-average remaining contractual term (years)	6 years	5 years 9 months 18 days
Outstanding, end of period - Aggregate intrinsic value	$ 209	$ 231
Exercisable, end of period - Aggregate intrinsic value	$ 145	$ 150
Weighted-average fair value of options granted	$ 6.70	$ 5.92