Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Oct. 29, 2017	Jul. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 298	$ 298
Finite-Lived Intangible Assets, Accumulated Amortization	(96)	(92)
Finite-Lived Intangible Assets, Net	202	206
Indefinite-Lived Intangible Assets (Excluding Goodwill)	910	912
Total net intangible assets	1,112	1,118
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	223	223
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