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Short-term Borrowings and Long-term Debt (Schedule of Short-term Debt) (Details) - USD ($)
$ in Millions
Jul. 28, 2019
Jul. 29, 2018
Short-term Debt [Line Items]    
Commercial Paper $ 853 $ 1,140
Notes Payable, Current 500 300
Capital Lease Obligations, Current 1 0
Debt, Current 1,371 1,525
Asset under Construction [Member]    
Short-term Debt [Line Items]    
Build-to-suit obligation current portion 20 0
Short-term Debt [Member]    
Short-term Debt [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [1] 3 5
Foreign Line of Credit [Member] | Variable Interest Rate [Member]    
Short-term Debt [Line Items]    
Line of Credit, Current $ 0 $ 90
[1] Includes unamortized net discount/premium on debt issuances and debt issuance costs.