Commitments and Contingencies - Schedule of Financing Guarantees Outstanding (Details) - USD ($) $ in Millions	Jul. 27, 2019	Jul. 28, 2018
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	$ 218	$ 308
Deferred revenue associated with financing guarantees:	(77)	(122)
Maximum potential future payments relating to financing guarantees, net of associated deferred revenue	141	186
Channel partner
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	197	277
Deferred revenue associated with financing guarantees:	(62)	(94)
End user
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	21	31
Deferred revenue associated with financing guarantees:	$ (15)	$ (28)