Commitments and Contingencies (Schedule of Financing Guarantees Outstanding) (Details) - USD ($) $ in Millions |
Apr. 27, 2019 |
Jul. 28, 2018 |
|---|---|---|
| Loss Contingencies [Line Items] | ||
| Maximum potential future payments relating to financing guarantees: | $ 240 | $ 308 |
| Deferred revenue associated with financing guarantees: | (81) | (122) |
| Maximum potential future payments relating to financing guarantees, net of associated deferred revenue | 159 | 186 |
| Channel partner | ||
| Loss Contingencies [Line Items] | ||
| Maximum potential future payments relating to financing guarantees: | 221 | 277 |
| Deferred revenue associated with financing guarantees: | (63) | (94) |
| End user | ||
| Loss Contingencies [Line Items] | ||
| Maximum potential future payments relating to financing guarantees: | 19 | 31 |
| Deferred revenue associated with financing guarantees: | $ (18) | $ (28) |