Equity Common Stock Repurchases (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Common Stock Repurchases [Abstract]
Common stock repurchases (in shares)	89	74	60
Common stock repurchases	$ 9,368	$ 7,499	$ 6,095