Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Oct. 25, 2020	Jul. 26, 2020	Apr. 26, 2020	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Numerator:
Net income	$ 1,131	$ 841	$ 755	$ 892	$ 698	$ 571	$ 666	$ 771	$ 3,619	$ 2,706	$ 3,038
Denominator:
Weighted average common shares outstanding (in shares)									916	937	1,013
Effect of dilutive stock options, restricted stock units and employee stock purchase plan shares (in shares)									7	8	13
Denominator for diluted earnings per share (in shares)									923	945	1,026
Earnings per share: basic (in dollars per share)									$ 3.95	$ 2.89	$ 3.00
Diluted earnings per share (in dollars per share)	$ 1.23	$ 0.91	$ 0.82	$ 0.96	$ 0.75	$ 0.61	$ 0.70	$ 0.80	$ 3.92	$ 2.86	$ 2.96
Potentially dilutive securities (in shares)									0	3	0