Stockholders' Equity, Options Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016
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)	$ 49.53	$ 45.62
Number exercisable options (in shares)	4,108	4,573
$ 3.04-49.53 [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)	$ 49.53
Number outstanding options (in shares)	10,760
Intrinsic value of outstanding options	$ 306
Weighted remaining contractual life	7 years
Weighted exercise price (in dollars per share)	$ 28.18
Number exercisable options (in shares)	4,108
Intrinsic value of exercisable options	$ 146
Unrecognized compensation	$ 35
Weighted recognition period	2 years