Financing Receivables and Operating Leases (Schedule Of Aging Analysis Of Financing Receivables) (Details) - USD ($) $ in Millions	Oct. 29, 2016	Jul. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,570	$ 1,393
Current	7,944	7,210
Total	9,514	8,603
Nonaccrual Financing Receivables	126	132
Impaired Financing Receivables	106	112
Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	428	354
Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	431	186
Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	711	853
Lease Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	405	387
Current	2,634	2,711
Total	3,039	3,098
Nonaccrual Financing Receivables	55	60
Impaired Financing Receivables	55	60
Lease Receivables | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	86	111
Lease Receivables | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	70	25
Lease Receivables | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	249	251
Loan Receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	143	76
Current	2,093	2,059
Total	2,236	2,135
Nonaccrual Financing Receivables	42	42
Impaired Financing Receivables	42	42
Loan Receivables | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25	30
Loan Receivables | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	23	9
Loan Receivables | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	95	37
Financed Service Contracts and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,022	930
Current	3,217	2,440
Total	4,239	3,370
Nonaccrual Financing Receivables	29	30
Impaired Financing Receivables	9	10
Financed Service Contracts and Other | Past due 31-60 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	317	213
Financed Service Contracts and Other | Past due 61-90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	338	152
Financed Service Contracts and Other | Past due 91 or above days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 367	$ 565