Commitments and Contingencies (Schedule of Financing Guarantees Outstanding) (Details) - USD ($) $ in Millions	Oct. 29, 2016	Jul. 30, 2016
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	$ 336	$ 377
Deferred revenue associated with financing guarantees:	(147)	(161)
Maximum potential future payments relating to financing guarantees, net of associated deferred revenue	189	216
Channel partner
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	248	281
Deferred revenue associated with financing guarantees:	(77)	(85)
End user
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees:	88	96
Deferred revenue associated with financing guarantees:	$ (70)	$ (76)