Financing Receivables and Operating Leases (Schedule Of Aging Analysis Of Financing Receivables) (Details) - USD ($) $ in Millions	Jan. 23, 2016	Jul. 25, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	$ 950	$ 1,313
Current	7,631	7,194
Total	8,581	8,507
Nonaccrual Financing Receivables	143	134
Impaired Financing Receivables	116	114
Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	429	507
Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	126	182
Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	395	624
Lease Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	310	302
Current	2,689	2,869
Total	2,999	3,171
Nonaccrual Financing Receivables	71	73
Impaired Financing Receivables	64	73
Lease Receivables | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	93	90
Lease Receivables | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	41	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	179	49
Current	1,998	1,714
Total	2,177	1,763
Nonaccrual Financing Receivables	43	32
Impaired Financing Receivables	43	32
Loan Receivables | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	91	21
Loan Receivables | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	40	3
Loan Receivables | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	48	25
Financed Service Contracts and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	461	962
Current	2,944	2,611
Total	3,405	3,573
Nonaccrual Financing Receivables	29	29
Impaired Financing Receivables	9	9
Financed Service Contracts and Other | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	245	396
Financed Service Contracts and Other | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	45	152
Financed Service Contracts and Other | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Amount	$ 171	$ 414