Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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
Numerator:
Net income	$ 698	$ 571	$ 666	$ 771	$ 757	$ 1,016	$ 1,100	$ 165	$ 2,706	$ 3,038	$ 3,519
Denominator:
Weighted average common shares outstanding (in shares)									937	1,013	1,073
Effect of dilutive stock options, restricted stock units and employee stock purchase plan shares (in shares)									8	13	11
Denominator for diluted earnings per share (in shares)									945	1,026	1,084
Earnings per share: basic (in dollars per share)									$ 2.89	$ 3.00	$ 3.28
Diluted earnings per share (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
Potentially dilutive securities (in shares)									3	0	0