Financing Receivables And Guarantees (Schedule Of Financing Receivables By Portfolio Segment Aging Analysis) (Detail) (USD $) In Millions, unless otherwise specified	Apr. 26, 2014	Jul. 27, 2013	Apr. 27, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
31 to 60 Days Past Due	$ 316	$ 166
61 to 90 Days Past Due	143	99
Greater Than 90 Days Past Due	419	527
Total Past Due	878	792
Financing Receivable Current	7,090	7,500
Gross Financing Receivable, Net of Unearned	7,968	8,292	8,073
Non-accrual financing receivables	86	56
Impaired Financing Receivables	70	42
Lease Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
31 to 60 Days Past Due	83	85
61 to 90 Days Past Due	41	48
Greater Than 90 Days Past Due	165	124
Total Past Due	289	257
Financing Receivable Current	3,248	3,250
Gross Financing Receivable, Net of Unearned	3,537	3,507	3,478
Non-accrual financing receivables	67	27
Impaired Financing Receivables	54	22
Loan Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
31 to 60 Days Past Due	5	6
61 to 90 Days Past Due	6	3
Greater Than 90 Days Past Due	15	11
Total Past Due	26	20
Financing Receivable Current	1,595	1,629
Gross Financing Receivable, Net of Unearned	1,621	1,649	1,671
Non-accrual financing receivables	8	11
Impaired Financing Receivables	8	9
Financed Service Contracts And Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
31 to 60 Days Past Due	228	75
61 to 90 Days Past Due	96	48
Greater Than 90 Days Past Due	239	392
Total Past Due	563	515
Financing Receivable Current	2,247	2,621
Gross Financing Receivable, Net of Unearned	2,810	3,136	2,924
Non-accrual financing receivables	11	18
Impaired Financing Receivables	$ 8	$ 11