Goodwill and Purchased Intangible Assets (Schedule Of Amortization Of Purchased Intangible Assets) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Oct. 29, 2016 |
Oct. 24, 2015 |
|
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Amortization of purchased intangible assets | $ 78 | $ 69 |
| Cost of sales | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Amortization of purchased intangible assets | 129 | 146 |
| Amortization of purchased intangible assets | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Amortization of purchased intangible assets | 78 | 69 |
| Restructuring and other charges | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Amortization of purchased intangible assets | 38 | 0 |
| Total | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Amortization of purchased intangible assets | $ 245 | $ 215 |