Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Oct. 28, 2018	Jul. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,145	$ 1,199
Finite-Lived Intangible Assets, Accumulated Amortization	(140)	(126)
Finite-Lived Intangible Assets, Net	1,005	1,073
Indefinite-lived Intangible Assets (Excluding Goodwill)	2,986	3,123
Total net intangible assets	3,991	4,196
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,063	1,116
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	$ 42	$ 43