Employee Benefit Plans - Additional Information (Details) $ in Billions	3 Months Ended		9 Months Ended
	May 01, 2021 USD ($) stock_incentive_plan shares	Apr. 25, 2020 shares	May 01, 2021 USD ($) period stock_incentive_plan shares	Apr. 25, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans (stock incentive plan) | stock_incentive_plan	1		1
Total compensation cost related to unvested share-based awards | $	$ 3.6		$ 3.6
Expected period of recognition of compensation cost			2 years 6 months
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares)	721,000,000		721,000,000
Consecutive offering period			24 months
Number of purchase periods | period			4
Purchase period			6 months
ESPP discount percentage from market price, beginning of purchase period			15.00%
Shares issued under employee purchase plan (in shares)	0	0	8,000,000	9,000,000
Shares reserved for issuance (in shares)	133,000,000		133,000,000
2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares)	790,000,000		790,000,000
Reduction in shares available for issuance (in shares)	1.5		1.5
Shares authorized for future grant (in shares)	257,000,000		257,000,000