Employee Benefit Plans - Employee Stock Incentive Plans (Details)	Jul. 25, 2020 stock_incentive_plan shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans (stock incentive plan) | stock_incentive_plan	1
2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares)	694,000,000
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)	183,000,000
Reduction in number of shares available for issuance after amendment (in shares)	1.5