Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Jul. 29, 2018	Jul. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,199	$ 298
Finite-Lived Intangible Assets, Accumulated Amortization	(126)	(92)
Finite-Lived Intangible Assets, Net	1,073	206
Indefinite-Lived Intangible Assets (Excluding Goodwill)	3,123	912
Total net intangible assets	4,196	1,118
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,116	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	$ 43	$ 35