Financing Receivables And Guarantees (Schedule Of Financing Guarantees Outstanding) (Detail) (USD $) In Millions, unless otherwise specified	Apr. 26, 2014	Jul. 27, 2013
Financing Guarantee Summary [Line Items]
Maximum potential future payments relating to financing guarantees	$ 476	$ 675
Deferred revenue associated with financing guarantees	(330)	(416)
Maximum potential future payments relating to financing guarantees, net of associated deferred revenue	146	259
Channel Partner
Financing Guarantee Summary [Line Items]
Maximum potential future payments relating to financing guarantees	247	438
Deferred revenue associated with financing guarantees	(132)	(225)
End User
Financing Guarantee Summary [Line Items]
Maximum potential future payments relating to financing guarantees	229	237
Deferred revenue associated with financing guarantees	$ (198)	$ (191)