Financing Receivables and Operating Leases (Schedule Of Aging Analysis Of Financing Receivables) (Details) - USD ($) $ in Millions	Oct. 24, 2015	Jul. 25, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	$ 954	$ 1,313
Current	7,742	7,194
Total	8,696	8,507
Nonaccrual Financing Receivables	126	134
Impaired Financing Receivables	95	114
Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	274	507
Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	186	182
Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	494	624
Lease Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	327	302
Current	2,808	2,869
Total	3,135	3,171
Nonaccrual Financing Receivables	83	73
Impaired Financing Receivables	72	73
Lease Receivables | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	100	90
Lease Receivables | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	51	27
Lease Receivables | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	176	185
Loan Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	176	49
Current	1,787	1,714
Total	1,963	1,763
Nonaccrual Financing Receivables	17	32
Impaired Financing Receivables	17	32
Loan Receivables | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	22	21
Loan Receivables | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	85	3
Loan Receivables | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	69	25
Financed Service Contracts and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	451	962
Current	3,147	2,611
Total	3,598	3,573
Nonaccrual Financing Receivables	26	29
Impaired Financing Receivables	6	9
Financed Service Contracts and Other | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	152	396
Financed Service Contracts and Other | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	50	152
Financed Service Contracts and Other | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	$ 249	$ 414