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Employee Benefit Plans (Additional Information) (Details)
$ / shares in Units, $ in Billions
9 Months Ended
Nov. 12, 2009
shares
Apr. 28, 2018
USD ($)
stock_incentive_plan
shares
Apr. 29, 2017
shares
Apr. 27, 2018
$ / shares
Jul. 29, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock incentive plans (stock incentive plan) | stock_incentive_plan   1      
Total compensation cost related to unvested share-based awards | $   $ 3.0      
Expected period of recognition of compensation cost   2 years 6 months      
Closing stock price (in dollars per share) | $ / shares       $ 44.71  
In-the-money exercisable stock option shares (in shares)   5,000,000      
Number Exercisable (in shares)         6,000,000
Weighted- average exercise price per share (in dollars per share) | $ / shares         $ 5.61
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for issuance (in shares)   621,400,000.0      
Expiration date for stock options and stock appreciation rights   24 months      
Shares eligible for employees purchase, percentage of discount   15.00%      
Shares issued under employee purchase plan, shares (in shares)   12,000,000 12,000,000    
Shares available for issuance (in shares)   88,000,000      
2005 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for issuance (in shares)   694,000,000      
Exercise price as a percentage of market value for Options 100.00%        
Award requisite service period   3 years      
PRSU allocation between Financial operating goals and TSR   50.00%      
2005 Plan | Stock awards subsequent to November 12, 2009          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reduction in shares available for issuance pursuant to November 12, 2009 amendment (in shares) 1.5 1.5      
2005 Plan | Stock awards subsequent to November 12, 2009 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration date for stock options and stock appreciation rights 10 years        
2005 Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   1 year      
2005 Plan | Employee Stock Option | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation award vesting rights, percentage   25.00%      
Award requisite service period   48 months      
2005 Plan | Employee Stock Option | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation award vesting rights, percentage   20.00%      
Award requisite service period   36 months      
2005 Plan | Performance base and Market base RSU          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award requisite service period   3 years      
2005 Plan | Performance based RSU based on Financial or nonFinancial operating goal | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award requisite service period   3 years      
2005 Plan | Performance based RSU based on Financial or nonFinancial operating goal | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award requisite service period   6 months      
2005 Plan | PRSU based on financial performance metrics | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation award vesting rights, percentage   150.00%      
2005 Plan | PRSU based on financial performance metrics | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation award vesting rights, percentage   0.00%      
2005 Plan | PRSU based on TSR | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation award vesting rights, percentage   150.00%      
2005 Plan | PRSU based on TSR | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation award vesting rights, percentage   0.00%      
2005 Plan | PRSU based on nonfinancial operating goals | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation award vesting rights, percentage   100.00%      
2005 Plan | PRSU based on nonfinancial operating goals | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation award vesting rights, percentage   0.00%      
2005 Plan | Time Based Stock Grants And Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years