Unaudited Quarterly Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 27, 2019	Oct. 28, 2018	Oct. 29, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 3,754	$ 3,562	$ 3,539	$ 3,753	$ 3,759	$ 4,162	$ 4,579	$ 4,205	$ 14,608	$ 16,705	$ 14,698
Gross profit	1,634	1,557	1,530	1,665	1,657	1,864	2,056	1,940	6,386	7,517	6,612
Net income	$ 698	$ 571	$ 666	$ 771	$ 757	$ 1,016	$ 1,100	$ 165	$ 2,706	$ 3,038	$ 3,519
Earnings per share: diluted (in dollars per share)	$ 0.75	$ 0.61	$ 0.70	$ 0.80	$ 0.77	$ 1.01	$ 1.06	$ 0.15	$ 2.86	$ 2.96	$ 3.25