Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 28, 2019	Jul. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 869	$ 931
Finite-Lived Intangible Assets, Accumulated Amortization	(83)	(31)
Finite-Lived Intangible Assets, Net	786	900
Indefinite-lived Intangible Assets (Excluding Goodwill)	2,629	2,764
Total net intangible assets	3,415	3,664
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	855	917
Finite-Lived Intangible Assets, Accumulated Amortization	(70)	(26)
Finite-Lived Intangible Assets, Net	785	891
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	14	14
Finite-Lived Intangible Assets, Accumulated Amortization	(13)	(5)
Finite-Lived Intangible Assets, Net	$ 1	$ 9
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Minimum [Member] | Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year 6 months
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	22 years
Maximum [Member] | Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years