Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016	Nov. 01, 2018
Accelerated Share Repurchases [Line Items]
Authorized shares of common stock	2,400,000,000	2,400,000,000
Common stock, par value	$ 0.001	$ 0.001
Authorized shares of preferred stock	7,500,000
Outstanding shares of preferred stock	0
Shares of common stock repurchased	131,500,000	37,500,000	34,900,000
Total cost of common stock repurchased	$ 7,200.0	$ 2,100.0	$ 2,000.0
Shares available for repurchase	48,800,000
Subsequent Event [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				120,000,000