Commitments and Contingencies - Schedule of Financing Guarantees Outstanding (Details) - USD ($) $ in Millions	May 01, 2021	Jul. 25, 2020
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	$ 171	$ 207
Deferred revenue associated with financing guarantees:	(22)	(28)
Total	149	179
Channel partner
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	165	198
Deferred revenue associated with financing guarantees:	(16)	(19)
End user
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	6	9
Deferred revenue associated with financing guarantees:	$ (6)	$ (9)