v2.4.0.6
Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 31, 2010
Income Tax [Line Items]      
Income tax benefit related to research and development tax credit   $ 65,000,000  
Combined tax benefits   724,000,000  
Reduction to the provision for income tax   158,000,000  
Increase in additional paid-in capital   566,000,000  
Undistributed earnings of certain foreign subsidiaries on which tax is not provided 41,300,000,000    
Gross income tax benefits attributable to tax incentives 1,300,000,000 1,300,000,000 1,700,000,000
Gross income tax benefits attributable to tax incentives per diluted share $ 0.24 $ 0.24 $ 0.30
Unrecognized tax benefits that would impact tax rate 2,400,000,000    
Net interest expense recognized 146,000,000 38,000,000  
Unrecognized tax benefit, penalties 21,000,000 9,000,000  
Unrecognized tax benefit accrual for interest and penalties 381,000,000 214,000,000  
Reduction in unrecognized tax benefits 220,000,000    
Unrecognized tax benefit decrease in accrued interest 218,000,000    
Unrecognized tax benefit that could be reduced in next 12 months 1,100,000,000    
Deferred tax assets valuation allowances 60,000,000 82,000,000  
Deferred tax assets, tax credit carry forwards, federal 6,000,000    
Deferred tax assets, tax credit carryforwards, state 562,000,000    
Deferred tax assets, tax credit carryforwards, foreign 4,000,000    
Expiring at the end of fiscal 2015
      
Income Tax [Line Items]      
Gross income tax benefits attributable to tax incentives 500,000,000    
Gross income tax benefits attributable to tax incentives per diluted share $ 0.09    
Federal Net Operating Loss Carryforwards
      
Income Tax [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards 321,000,000    
State Net Operating Loss Carryforwards
      
Income Tax [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards 1,500,000,000    
Foreign Net Operating Loss Carryforwards
      
Income Tax [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards 240,000,000    
Deferred tax assets valuation allowances $ 55,000,000    
Federal
      
Income Tax [Line Items]      
Operating loss carry forwards, expiration 2019    
Tax credit carryforward, expiration 2019    
Foreign and State
      
Income Tax [Line Items]      
Operating loss carry forwards, expiration 2013    
Foreign
      
Income Tax [Line Items]      
Tax credit carryforward, expiration 2027