Commitments and Contingencies (Schedule of Other Commitments) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Apr. 27, 2019 |
Apr. 28, 2018 |
Apr. 27, 2019 |
Apr. 28, 2018 |
|
| Acquisition | ||||
| Contingency [Line Items] | ||||
| Compensation expense related to acquisitions | $ 76 | $ 53 | $ 251 | $ 141 |