Financing Receivables and Operating Leases (Schedule Of Aging Analysis Of Financing Receivables) (Details) - USD ($) $ in Millions	Apr. 29, 2017	Jul. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,434	$ 1,393
Current	7,967	7,210
Total	9,401	8,603
Nonaccrual Financing Receivables	142	132
Impaired Financing Receivables	122	112
Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	406	354
Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	267	186
Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	761	853
Lease Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	516	387
Current	2,130	2,711
Total	2,646	3,098
Nonaccrual Financing Receivables	52	60
Impaired Financing Receivables	52	60
Lease Receivables | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	131	111
Lease Receivables | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	110	25
Lease Receivables | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	275	251
Loan Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	120	76
Current	2,539	2,059
Total	2,659	2,135
Nonaccrual Financing Receivables	59	42
Impaired Financing Receivables	59	42
Loan Receivables | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	31	30
Loan Receivables | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	28	9
Loan Receivables | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	61	37
Financed Service Contracts and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	798	930
Current	3,298	2,440
Total	4,096	3,370
Nonaccrual Financing Receivables	31	30
Impaired Financing Receivables	11	10
Financed Service Contracts and Other | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	244	213
Financed Service Contracts and Other | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	129	152
Financed Service Contracts and Other | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 425	$ 565