Commitments and Contingencies (Schedule of Financing Guarantees Outstanding) (Details) - USD ($) $ in Millions |
Oct. 27, 2018 |
Jul. 28, 2018 |
|---|---|---|
| Loss Contingencies [Line Items] | ||
| Maximum potential future payments relating to financing guarantees: | $ 335 | $ 308 |
| Deferred revenue associated with financing guarantees: | (98) | (122) |
| Maximum potential future payments relating to financing guarantees, net of associated deferred revenue | 237 | 186 |
| Channel partner | ||
| Loss Contingencies [Line Items] | ||
| Maximum potential future payments relating to financing guarantees: | 307 | 277 |
| Deferred revenue associated with financing guarantees: | (72) | (94) |
| End user | ||
| Loss Contingencies [Line Items] | ||
| Maximum potential future payments relating to financing guarantees: | 28 | 31 |
| Deferred revenue associated with financing guarantees: | $ (26) | $ (28) |