Financing Receivables and Operating Leases (Schedule Of Aging Analysis Of Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	Jul. 26, 2014	Jul. 27, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 days past due (Includes billed and unbilled)	$ 407	$ 166
61-90 days past due (includes billed and unbilled)	282	99
90 days or over past due ( includes billed and unbilled)	411	527
Total Past Due	1,100	792
Current	7,087	7,249
Total	8,187	8,041
Nonaccrual Financing Receivables	79	56
Impaired Financing Receivables	69	42
Lease Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 days past due (Includes billed and unbilled)	104	85
61-90 days past due (includes billed and unbilled)	43	48
90 days or over past due ( includes billed and unbilled)	165	124
Total Past Due	312	257
Current	2,982	2,999
Total	3,294	3,256
Nonaccrual Financing Receivables	48	27
Impaired Financing Receivables	41	22
Loan Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 days past due (Includes billed and unbilled)	2	6
61-90 days past due (includes billed and unbilled)	1	3
90 days or over past due ( includes billed and unbilled)	16	11
Total Past Due	19	20
Current	1,664	1,629
Total	1,683	1,649
Nonaccrual Financing Receivables	19	11
Impaired Financing Receivables	19	9
Financed Service Contracts and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 days past due (Includes billed and unbilled)	301	75
61-90 days past due (includes billed and unbilled)	238	48
90 days or over past due ( includes billed and unbilled)	230	392
Total Past Due	769	515
Current	2,441	2,621
Total	3,210	3,136
Nonaccrual Financing Receivables	12	18
Impaired Financing Receivables	$ 9	$ 11