Shareholders' Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016
Stockholders' Equity Note [Abstract]
Repurchase of common stock under the stock repurchase program, Shares Repurchased (in shares)	103	51	38	15	33	32
Repurchase of common stock under the stock repurchase program, Weighted-Average Price per Share (in dollars per share)	$ 39.07	$ 31.80	$ 31.61	$ 33.71	$ 30.33	$ 31.12
Repurchase of common stock under the stock repurchase program, Amount Repurchased	$ 4,011	$ 1,620	$ 1,201	$ 503	$ 1,001	$ 1,001