Stock Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	21	20
Granted (in shares)	3	6
Exercised (in shares)	(4)	(3)
Forfeitures and expirations (in shares)	0	(1)
Outstanding, end of period (in shares)	20	22
Exercisable, end of period (in shares)	12	11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period, weighted-average exercise price (in dollars per share)	$ 56	$ 54
Granted, weighted-average exercise price (in dollars per share)	64	60
Exercised, weighted-average exercise price (in dollars per share)	53	50
Forfeitures and expirations, weighted-average exercise price (in dollars per share)	0	58
Outstanding, end of period, weighted-average exercise price (in dollars per share)	58	56
Exercisable, end of period, weighted-average exercise price (in dollars per share)	$ 55	$ 52
Outstanding, end of period, weighted-average remaining contractual term	7 years 1 month 6 days	7 years 3 months 18 days
Exercisable, end of period, weighted-average remaining contractual term	6 years	5 years 9 months 18 days
Outstanding, end of period, aggregate intrinsic value	$ 192	$ 132
Exercisable, end of period, aggregate intrinsic value	$ 145	$ 102
Weighted-average fair value of options granted (in dollars per share)	$ 7.20	$ 6.70