Financing Receivables And Guarantees (Schedule Of Financing Receivables Categorized By Internal Credit Risk Rating) (Detail) (USD $) In Millions, unless otherwise specified	Apr. 26, 2014	Jul. 27, 2013	Apr. 27, 2013
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	$ 7,968	$ 8,292	$ 8,073
Rating One To Four [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	4,067	4,399
Rating Five To Six [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	3,312	3,400
Rating Seven And Higher [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	346	242
Total Internal Credit Risk Rating [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	7,725	8,041
Residual Value [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	243	251
Lease Receivables
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	3,537	3,507	3,478
Lease Receivables | Rating One To Four [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	1,604	1,681
Lease Receivables | Rating Five To Six [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	1,557	1,482
Lease Receivables | Rating Seven And Higher [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	133	93
Lease Receivables | Total Internal Credit Risk Rating [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	3,294	3,256
Lease Receivables | Residual Value [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	243	251
Loan Receivables
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	1,621	1,649	1,671
Loan Receivables | Rating One To Four [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	894	842
Loan Receivables | Rating Five To Six [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	595	777
Loan Receivables | Rating Seven And Higher [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	132	30
Loan Receivables | Total Internal Credit Risk Rating [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	1,621	1,649
Loan Receivables | Residual Value [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	0	0
Financed Service Contracts And Other
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	2,810	3,136	2,924
Financed Service Contracts And Other | Rating One To Four [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	1,569	1,876
Financed Service Contracts And Other | Rating Five To Six [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	1,160	1,141
Financed Service Contracts And Other | Rating Seven And Higher [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	81	119
Financed Service Contracts And Other | Total Internal Credit Risk Rating [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	2,810	3,136
Financed Service Contracts And Other | Residual Value [Member]
Financing Receivables And Guarantees [Line Items]
Gross Receivables, Net of Unearned Income	$ 0	$ 0