Financing Receivables and Operating Leases (Schedule Of Aging Analysis Of Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	Oct. 25, 2014	Jul. 26, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 days past due (Includes billed and unbilled)	$ 241	$ 407
61-90 days past due (includes billed and unbilled)	258	282
90 days or over past due ( includes billed and unbilled)	817	411
Total Past Due	1,316	1,100
Current	6,774	7,087
Total	8,090	8,187
Nonaccrual Financing Receivables	100	79
Impaired Financing Receivables	83	69
Lease Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 days past due (Includes billed and unbilled)	80	104
61-90 days past due (includes billed and unbilled)	54	43
90 days or over past due ( includes billed and unbilled)	196	165
Total Past Due	330	312
Current	2,945	2,982
Total	3,275	3,294
Nonaccrual Financing Receivables	47	48
Impaired Financing Receivables	39	41
Loan Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 days past due (Includes billed and unbilled)	17	2
61-90 days past due (includes billed and unbilled)	41	1
90 days or over past due ( includes billed and unbilled)	89	16
Total Past Due	147	19
Current	1,597	1,664
Total	1,744	1,683
Nonaccrual Financing Receivables	41	19
Impaired Financing Receivables	37	19
Financed Service Contracts and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 days past due (Includes billed and unbilled)	144	301
61-90 days past due (includes billed and unbilled)	163	238
90 days or over past due ( includes billed and unbilled)	532	230
Total Past Due	839	769
Current	2,232	2,441
Total	3,071	3,210
Nonaccrual Financing Receivables	12	12
Impaired Financing Receivables	$ 7	$ 9