Financing Receivables and Operating Leases (Additional Information) (Details) $ in Millions |
9 Months Ended | |
|---|---|---|
|
Apr. 27, 2019
USD ($)
rating
|
Jul. 28, 2018
USD ($)
|
|
| Financing Receivables And Guarantees [Line Items] | ||
| Average lease term | 4 years | |
| Threshold for past due receivables | 31 days | |
| Unbilled or current financing receivables included in greater than 91 days plus past due | $ | $ 249 | $ 503 |
| Financing receivable, 91 days past due and still accruing | $ | $ 231 | $ 182 |
| Investment credit risk ratings range lowest (rating) | 1 | |
| Highest rating when receivables are deemed impaired (rating) | 10 | |
| Rating at or higher when receivables deemed impaired (rating) | 8 | |
| Maximum | ||
| Financing Receivables And Guarantees [Line Items] | ||
| Loan receivables term | 3 years | |
| Maximum | Financed Service Contracts | ||
| Financing Receivables And Guarantees [Line Items] | ||
| Financed service contracts term | 3 years | |
| Minimum | Financed Service Contracts | ||
| Financing Receivables And Guarantees [Line Items] | ||
| Financed service contracts term | 1 year |