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Short-term Borrowings and Long-term Debt (Schedule of Short-term Debt) (Details) - USD ($)
$ in Millions
Jan. 26, 2020
Jul. 28, 2019
Short-term Debt [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (35) $ (49)
Debt, Current, Total 902 1,371
Other Current Liabilities    
Short-term Debt [Line Items]    
Commercial Paper 401 853
Notes Payable, Current 500 500
Finance Lease, Liability, Current 1 1
Build-to-suit obligation current portion 0 20
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0 (3)
Debt, Current, Total $ 902 $ 1,371