Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions |
Jan. 31, 2016 |
Aug. 02, 2015 |
|---|---|---|
| Indefinite-lived Intangible Assets [Line Items] | ||
| Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 958 | $ 960 |
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross | 297 | 297 |
| Finite-Lived Intangible Assets, Accumulated Amortization | (62) | (52) |
| Finite-Lived Intangible Assets, Net | 235 | 245 |
| Intangible Assets, Net (Excluding Goodwill) [Abstract] | ||
| Total net intangible assets | 1,193 | 1,205 |
| Customer Relationships [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross | 222 | 222 |
| Developed Technology Rights [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross | 40 | 40 |
| Other Intangible Assets [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross | $ 35 | $ 35 |