Stock Compensation Summary of Share-based Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Share-based Payment Arrangement [Abstract]
Outstanding, beginning of period - shares	14	14	15
Granted - shares	3	3	2
Exercised - shares	(1)	(2)	(2)
Forfeitures and expirations - shares	(2)	(1)	(1)
Outstanding, end of period - shares	14	14	14
Exerciseable, end of period - shares	10	10	10
Outstanding, beginning of period - weighted-average exercise price	$ 66	$ 64	$ 62
Granted - weighted-average exercise price	57	70	73
Exercised - weighted-average exercise price	56	58	57
Forfeitures and expirations - weighted-average exercise price	67	71	70
Outstanding, end of period - weighted-average exercise price	65	66	64
Exercisable, end of period - weighted-average exercise price	$ 65	$ 63	$ 60
Outstanding, end of period - weighted-average remaining contractual term (years)	4 years 10 months 24 days
Excerciseable, end of period - weighted-average remaining contractual term (years)	6 years 1 month 6 days
Outstanding, end of period - aggregate intrinsic value	$ 55
Exerciseable, end of period - aggregate intrinsic value	86
Total intrinsic value of options exercised	$ 7	$ 33	$ 22