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Fair Value (Additional Information) (Details) - USD ($)
Jan. 26, 2019
Jul. 28, 2018
Jan. 27, 2018
Fair Value Measurements [Line Items]      
Senior notes, carrying value $ 25,630,000,000 $ 25,569,000,000  
Level 3      
Fair Value Measurements [Line Items]      
Long term loan receivables and financed service contracts and others carrying value 3,300,000,000 3,600,000,000  
Level 2      
Fair Value Measurements [Line Items]      
Senior notes, fair value 26,500,000,000 26,400,000,000  
Senior notes, carrying value $ 25,600,000,000 $ 25,600,000,000  
Fair Value, Measurements, Nonrecurring | Property held for sale—land and buildings | Level 3      
Fair Value Measurements [Line Items]      
Carrying value of the property held for sale     $ 0