Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Jan. 31, 2016	Aug. 02, 2015
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 958	$ 960
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	297	297
Finite-Lived Intangible Assets, Accumulated Amortization	(62)	(52)
Finite-Lived Intangible Assets, Net	235	245
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Total net intangible assets	1,193	1,205
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	222	222
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