Business And Geographic Segment Information Business And Geographic Segment Information (Geographic Information, Long-lived Assets) (Details) - USD ($) $ in Millions	Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	$ 2,454	$ 2,407	$ 2,347
UNITED STATES
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	1,987	1,967	1,942
AUSTRALIA
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	265	242	232
Other Countries [Member]
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	$ 202	$ 198	$ 173