Business And Geographic Segment Information Business And Geographic Segment Information (Geographic Information, Long-lived Assets) (Details) - USD ($) $ in Millions	Jul. 29, 2018	Jul. 30, 2017	Jul. 31, 2016
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	$ 3,233	$ 2,454	$ 2,407
UNITED STATES
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	2,778	1,987	1,967
AUSTRALIA
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	248	265	242
Other Countries [Member]
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	$ 207	$ 202	$ 198