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Fair Value (Additional Information) (Details) - USD ($)
Jan. 27, 2018
Jul. 29, 2017
Jan. 28, 2017
Fair Value Measurements [Line Items]      
Senior notes, carrying value $ 30,374,000,000 $ 30,472,000,000  
Reported Value Measurement      
Fair Value Measurements [Line Items]      
Carrying value of the property held for sale 0   $ 11,000,000
Investments in privately held companies (impaired)      
Fair Value Measurements [Line Items]      
Carrying value of cost method investments in privately held companies 861,000,000 859,000,000  
Level 3      
Fair Value Measurements [Line Items]      
Long term loan receivables and financed service contracts and others carrying value 3,500,000,000 3,400,000,000  
Level 3 | Remaining carrying value of impaired investments      
Fair Value Measurements [Line Items]      
Remaining carrying value of the investments that were impaired 44,000,000   44,000,000
Level 3 | Remaining carrying value of impaired purchased intangibles      
Fair Value Measurements [Line Items]      
Remaining carrying value of the investments that were impaired     $ 9,000,000
Level 2      
Fair Value Measurements [Line Items]      
Senior notes, fair value 31,800,000,000 32,100,000,000  
Senior notes, carrying value $ 30,400,000,000 $ 30,500,000,000