Financing Receivables And Guarantees (Schedule Of Financing Guarantees Outstanding) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 26, 2013	Jul. 27, 2013
Financing Guarantee Summary [Line Items]
Maximum potential future payments relating to financing guarantees	$ 706	$ 675
Deferred revenue associated with financing guarantees	(421)	(416)
Maximum potential future payments relating to financing guarantees, net of associated deferred revenue	285	259
Channel Partner
Financing Guarantee Summary [Line Items]
Maximum potential future payments relating to financing guarantees	483	438
Deferred revenue associated with financing guarantees	(232)	(225)
End User
Financing Guarantee Summary [Line Items]
Maximum potential future payments relating to financing guarantees	223	237
Deferred revenue associated with financing guarantees	$ (189)	$ (191)