Stockholders' Equity, Options Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Stockholders' Equity [Abstract]
Range of exercise prices, lower limit (in dollars per share)	$ 3.04	$ 3.04
Range of exercise prices, upper limit (in dollars per share)	$ 54.33	$ 54.33
Number exercisable (in shares)	4,720	5,154
$ 3.04-54.33 [Member]
Stockholders' Equity [Abstract]
Range of exercise prices, lower limit (in dollars per share)	$ 3.04
Range of exercise prices, upper limit (in dollars per share)	$ 54.33
Number outstanding (in shares)	10,263
Intrinsic value of outstanding	$ 69
Weighted remaining contractual life	6 years 6 months
Weighted exercise price (in dollars per share)	$ 37.82
Number exercisable (in shares)	4,720
Intrinsic value of exercisable	$ 54
Unrecognized compensation	$ 5
Weighted recognition period	2 years 1 month 6 days