Commitments and Contingencies - Schedule of Financing Guarantees Outstanding (Details) - USD ($) $ in Millions	Jan. 23, 2021	Jul. 25, 2020
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	$ 213	$ 207
Deferred revenue associated with financing guarantees:	(27)	(28)
Total	186	179
Channel partner
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	205	198
Deferred revenue associated with financing guarantees:	(19)	(19)
End user
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	8	9
Deferred revenue associated with financing guarantees:	$ (8)	$ (9)