Stock Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 01, 2017	Apr. 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)	(3)
Forfeitures and expirations (in shares)	0	0
Outstanding, end of period (in shares)	16	19
Exercisable, end of period (in shares)	11	12
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)	56	55
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 2 months 12 days	7 years 4 months 24 days
Exercisable, end of period, weighted-average remaining contractual term	6 years 3 months 18 days	6 years 4 months 24 days
Outstanding, end of period, aggregate intrinsic value	$ 147	$ 306
Exercisable, end of period, aggregate intrinsic value	$ 140	$ 242
Weighted-average fair value of options granted (in dollars per share)	$ 10.14	$ 9.45