Employee Benefit Plans - Additional Information (Details) $ in Billions		3 Months Ended		6 Months Ended
	Dec. 10, 2020 shares	Jan. 23, 2021 USD ($) stock_incentive_plan shares	Jan. 25, 2020 shares	Jan. 23, 2021 USD ($) period stock_incentive_plan shares	Jan. 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 | $		$ 4.0		$ 4.0
Expected period of recognition of compensation cost				2 years 8 months 12 days
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)		8,000,000	9,000,000	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]
Extension term of plan	9 years
Additional shares approved (in shares)	96,000,000
Shares reserved for issuance (in shares)		790,000,000		790,000,000
2005 Plan | Stock awards subsequent to November 12, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares)		253,000,000		253,000,000
Reduction in shares available for issuance pursuant to November 12, 2009 amendment (in shares)		1.5		1.5