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Employee Benefit Plans - Additional Information (Detail) (USD $)
In Billions, except Share data, unless otherwise specified
9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Apr. 26, 2014
stock_incentive_plan
Apr. 25, 2014
Jul. 27, 2013
Apr. 26, 2014
2005 Plan
Apr. 26, 2014
2005 Plan
Stock awards prior to November 12, 2009
Apr. 26, 2014
2005 Plan
Stock awards subsequent to November 12, 2009
Apr. 26, 2014
2005 Plan
Employee Stock Option
Minimum
Apr. 26, 2014
2005 Plan
Employee Stock Option
Maximum
Apr. 26, 2014
2005 Plan
Restricted Stock Units (RSUs)
Minimum
Apr. 26, 2014
2005 Plan
Restricted Stock Units (RSUs)
Maximum
Apr. 26, 2014
2005 Plan
Performance Restricted Stock Units
Apr. 26, 2014
1996 Plan
Apr. 26, 2014
1996 Plan
M
Apr. 26, 2014
1996 Plan
Minimum
Apr. 26, 2014
1996 Plan
Maximum
Apr. 26, 2014
Employee Stock Purchase Plan
Apr. 27, 2013
Employee Stock Purchase Plan
Apr. 26, 2014
Employee Stock Purchase Plan
Balance available for issuance (shares) [Member]
Apr. 26, 2014
Operating Goal [Member]
Performance Restricted Stock Units
Minimum
Apr. 26, 2014
Operating Goal [Member]
Performance Restricted Stock Units
Maximum
Apr. 26, 2014
TSR Goal [Member]
Performance Restricted Stock Units
Minimum
Apr. 26, 2014
TSR Goal [Member]
Performance Restricted Stock Units
Maximum
Apr. 26, 2014
Non-financial operating goals [Member]
Performance Restricted Stock Units
Minimum
Apr. 26, 2014
Non-financial operating goals [Member]
Performance Restricted Stock Units
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                
Number Of Stock Incentive Plans 4                                              
Shares reserved for issuance (in shares)       694,000,000                       471,400,000   38,000,000            
Reduction in number of shares available for issuance after amendment approved by shareholders (ratio)       1.5                                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                       2,500,000,000 2,500,000,000                      
Stock options and stock appreciation rights exercise price percentage of the fair market value of the underlying stock on the grant date (percentage)       100.00%                 100.00%                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         9 years 10 years           9 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             25.00% 20.00% 25.00% 20.00%       25.00% 20.00%       0.00% 150.00% 0.00% 150.00% 0.00% 100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period             36 months 48 months     3 years     36 months 48 months                  
Number of months in which stock options ratably exercise, nonstandard (in months)                         60                      
ESPP- offering period description                               24-month offering period, which consists of four consecutive 6-month purchase periods. Employees may purchase a limited number of shares of the Company’s stock at a discount of up to 15% of the lesser of the market value at the beginning of the offering period or the end of each 6-month purchase period.                
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date (in percentage)                               15.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date                               Jan. 03, 2020                
Shares issued under employee purchase plan (in shares)                               14,000,000 18,000,000              
Unrecognized compensation cost related to unvested share-based awards $ 2.7                                              
Expected period of recognition of compensation cost, years 2 years 4 months 24 days                                              
Closing Stock Price   $ 23.00                                            
In-the-money exercisable stock option (in shares) 47,000,000                                              
Stock options exercisable (in shares) 218,000,000   271,000,000                                          
Stock options exercisable, weighted-average exercise price per share $ 25.57   $ 24.84                                          
Performance restricted stock units, based on operating performance goals 50.00%                                              
Performance restricted stock units, based on TSR 50.00%