Stock Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jul. 04, 2015	Jun. 28, 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)	(2)	(2)
Forfeitures and expirations (in shares)	0	(1)
Outstanding, end of period (in shares)	22	23
Exercisable, end of period (in shares)	13	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	57
Outstanding, end of period, weighted-average exercise price (in dollars per share)	57	55
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 6 months
Exercisable, end of period, weighted-average remaining contractual term	6 years 1 month 6 days	6 years
Outstanding, end of period, aggregate intrinsic value	$ 131	$ 209
Exercisable, end of period, aggregate intrinsic value	$ 114	$ 145
Weighted-average fair value of options granted (in dollars per share)	$ 7.20	$ 6.70