v2.4.0.6
Employee Stock Benefit Plans - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Mar. 17, 2011
Jul. 28, 2012
Year
Jul. 30, 2011
Jul. 31, 2010
Jul. 27, 2012
Jul. 28, 2012
Performance Based Restricted Stock Units
Dec. 31, 2007
Supplemental Plan
Jul. 28, 2012
Employee Stock Purchase Rights
Jul. 30, 2011
Employee Stock Purchase Rights
Jul. 31, 2010
Employee Stock Purchase Rights
Jul. 28, 2012
2005 Plan
Month
Year
Nov. 12, 2009
2005 Plan
Nov. 15, 2007
2005 Plan
Jul. 28, 2012
2005 Plan
Time Based Stock Grants and Time Based RSUs
Nov. 12, 2009
2005 Plan
Employee Stock Purchase Rights
Jul. 28, 2012
1996 Plan
Month
Jul. 28, 2012
Employee 401(K) Plans
Jul. 30, 2011
Employee 401(K) Plans
Jul. 31, 2010
Employee 401(K) Plans
Jul. 28, 2012
Deferred Compensation Plans
Jul. 30, 2011
Deferred Compensation Plans
Jul. 28, 2012
Defined Contribution Pension
Employee 401(K) Plans
Employee
Maximum
Jul. 28, 2012
Defined Contribution Pension
Deferred Compensation Plans
Employee
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                              
Number of stock incentive plans   5                                          
Shares reserved in employee stock incentive plan             9,000,000           559,000,000     2,500,000,000              
Reduction in number of shares available for issuance after amendment                       1.5                      
Stock options and stock appreciation rights exercise price percentage of the fair market value of the underlying stock on the grant date                     100.00%         100.00%              
Prior to 11/12/09, expiration date for stock options and stock appreciation rights, max time from grant date prior to date, in years                             Nine Nine              
After 11/12/09, expiration date for stock options and stock appreciation rights, max time from grant date prior to date, in years                     10                        
Percentage in which stock options and RSUs become exercisable for within one year from the date of grant, minimum                     20.00%     20.00%   20.00%              
Percentage in which stock options and RSUs become exercisable for within one year from the date of grant, maximum                     25.00%     25.00%   25.00%              
Stock options exercisable, period after grant date                     1 year         1 year              
Number of months in which stock options ratably exercise, minimum                     36         36              
Number of months in which stock options ratably exercise, maximum                     48         48              
Ratable vesting period, months                               60              
ESPP-Shares reserved   471,400,000                                          
ESPP-Offering Period Plan Description   24-month offering period, which consists of four consecutive 6-month purchase periods                                          
ESPP-Termination of Purchase Plan   January 3, 2020                                          
ESPP-Discount rate   15.00%                                          
Shares issued under employee purchase plan   35,000,000 34,000,000 27,000,000                                      
ESPP-shares available for issuance   87,000,000                                          
Total compensation cost related to unvested share-based awards   $ 2,000,000,000                                          
Expected period of recognition of compensation cost, years   2.4                                          
Income tax benefit for employee share-based compensation expense   335,000,000 444,000,000 415,000,000                                      
Total pretax intrinsic value   333,000,000 312,000,000 1,000,000,000                                      
Closing stock price         $ 15.69                                    
In-the-money exercisable stock option shares   10,000,000                                          
Stock Options Exercisable   512,000,000 575,000,000                                        
Stock Options Exercisable, Weighted-Average Exercise Price per Share   $ 22.65 $ 21.37                                        
Performance restricted stock and stock unit awards or ("PRSUs"), granted in period           2,000,000                                  
Expected dividend yield 0.00%             1.50% 0.00% 0.00%                          
Employee contribution minimum rate                                 1.00%            
Employee contribution maximum rate                                 75.00%            
Company maximum match rate                                 100.00%            
Company match on employee contribution                                 4.50%     4.50%      
Maximum matching contribution allocated to each participant   11,250                                          
Annual limit on eligible earnings                                           250,000 1,500,000
Company's matching contributions                                 231,000,000 239,000,000 210,000,000        
Deferred compensation liability                                       $ 355,000,000 $ 375,000,000