Stock Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	15	19
Granted (in shares)	2	3
Exercised (in shares)	(1)	(4)
Forfeitures and expirations (in shares)	0	0
Outstanding, end of period (in shares)	16	18
Exercisable, end of period (in shares)	11	10
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)	$ 62	$ 58
Granted, weighted-average exercise price (in dollars per share)	73	76
Exercised, weighted-average exercise price (in dollars per share)	57	56
Forfeitures and expirations, weighted-average exercise price (in dollars per share)	0	0
Outstanding, end of period, weighted-average exercise price (in dollars per share)	64	61
Exercisable, end of period, weighted-average exercise price (in dollars per share)	$ 60	$ 57
Outstanding, end of period, weighted-average remaining contractual term	7 years	7 years 2 months 24 days
Exercisable, end of period, weighted-average remaining contractual term	6 years 1 month 6 days	6 years 2 months 24 days
Outstanding, end of period, aggregate intrinsic value	$ 109	$ 335
Exercisable, end of period, aggregate intrinsic value	$ 104	$ 247
Weighted-average fair value of options granted (in dollars per share)	$ 10.14	$ 9.44