Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Jan. 28, 2018	Jul. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 386	$ 298
Finite-Lived Intangible Assets, Accumulated Amortization	(101)	(92)
Finite-Lived Intangible Assets, Net	285	206
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,200	912
Total net intangible assets	1,485	1,118
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	311	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