Commitments and Contingencies (Schedule of Financing Guarantees Outstanding) (Details) - USD ($) $ in Millions	Jul. 30, 2016	Jul. 25, 2015
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	$ 377	$ 417
Deferred revenue associated with financing guarantees:	(161)	(234)
Maximum potential future payments relating to financing guarantees, net of associated deferred revenue	216	183
Channel partner
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	281	288
Deferred revenue associated with financing guarantees:	(85)	(127)
End user
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	96	129
Deferred revenue associated with financing guarantees:	$ (76)	$ (107)