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Employee Benefit Plans (Additional Information) (Details)
$ / shares in Units, $ in Billions
9 Months Ended
Apr. 30, 2016
USD ($)
$ / shares
stock_incentive_plan
shares
Apr. 29, 2016
$ / shares
Jul. 25, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock incentive plans | stock_incentive_plan 3    
Total compensation cost related to unvested share-based awards | $ $ 2.8    
Expected period of recognition of compensation cost, years 2 years 5 months 18 days    
Closing stock price | $ / shares   $ 27.49  
In-the-money exercisable stock option shares 12,000,000    
Number Exercisable, shares 72,000,000   102,000,000
Weighted- Average Exercise Price per Share | $ / shares $ 29.12   $ 29.02
Description of PRSU granted contingent on performance metrics generally 50% of the PRSUs are earned based on the average of annual operating cash flow and earnings per share goals established at the beginning of each fiscal year over a three-year performance period. Generally, the remaining 50% of the PRSUs are earned based on the Company’s TSR measured against the benchmark TSR of a peer group over the same period.    
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 (in percentage) 100.00%    
PRSU allocation between Financial operating goals and TSR 50.00%    
2005 Plan | Stock awards prior 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 (in years) 9 years    
2005 Plan | Stock awards subsequent to November 12, 2009 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Reduction in shares available for issuance pursuant to November 12, 2009 amendment (ratio) 1.5    
2005 Plan | Stock awards subsequent to November 12, 2009 [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration date for stock options and stock appreciation rights (in years) 10 years    
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%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 36 months    
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%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 48 months    
2005 Plan | Time based stock award | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Award Vesting Rights, Percentage 20.00%    
2005 Plan | Time based stock award | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Award Vesting Rights, Percentage 25.00%    
2005 Plan | Performance base and Market base RSU [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years    
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 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 TSR [Member] | 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 [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Award Vesting Rights, Percentage 150.00%    
2005 Plan | Performance based RSU based on Financial or nonFinancial operating goal [Member] | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 6 months    
2005 Plan | Performance based RSU based on Financial or nonFinancial operating goal [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years    
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 | 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%