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Financing Receivables and Operating Leases - Schedule of Financing Receivables Categorized by Internal Credit Risk Rating (Details) - USD ($) $ in Millions | Jul. 27, 2019 | Jul. 28, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | $ 10,037 | $ 9,872
1 to 4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 5,984 | 5,946
5 to 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 3,850 | 3,786
7 and Higher |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 203 | 140
Lease receivables |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 2,230 | 2,547
Lease receivables | 1 to 4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 1,204 | 1,294
Lease receivables | 5 to 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 991 | 1,199
Lease receivables | 7 and Higher |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 35 | 54
Loan receivables |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 5,438 | 4,999
Loan receivables | 1 to 4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 3,367 | 3,184
Loan receivables | 5 to 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 1,920 | 1,752
Loan receivables | 7 and Higher |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 151 | 63
Financed service contracts |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 2,369 | 2,326
Financed service contracts | 1 to 4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 1,413 | 1,468
Financed service contracts | 5 to 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | 939 | 835
Financed service contracts | 7 and Higher |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross receivables | $ 17 | $ 23

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