Stock Compensation Summary of Share-based Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Share-based Payment Arrangement [Abstract]
Outstanding, beginning of period - shares	14	14	14
Granted - shares	3	3	3
Exercised - shares	(2)	(1)	(2)
Forfeitures and expirations - shares	(1)	(2)	(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	$ 65	$ 66	$ 64
Granted - weighted-average exercise price	65	57	70
Exercised - weighted-average exercise price	59	56	58
Forfeitures and expirations - weighted-average exercise price	68	67	71
Outstanding, end of period - weighted-average exercise price	65	65	66
Exercisable, end of period - weighted-average exercise price	$ 66	$ 65	$ 63
Outstanding, end of period - weighted-average remaining contractual term (years)	4 years 8 months 12 days
Excerciseable, end of period - weighted-average remaining contractual term (years)	5 years 10 months 24 days
Outstanding, end of period - aggregate intrinsic value	$ 15
Exerciseable, end of period - aggregate intrinsic value	22
Total intrinsic value of options exercised	$ 17	$ 7	$ 33