Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Jan. 27, 2019	Jul. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 968	$ 1,199
Finite-Lived Intangible Assets, Accumulated Amortization	(87)	(126)
Finite-Lived Intangible Assets, Net	881	1,073
Indefinite-lived Intangible Assets (Excluding Goodwill)	2,871	3,123
Total net intangible assets	3,752	4,196
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	917	1,116
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	10	40
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 41	$ 43