Business And Geographic Segment Information Business And Geographic Segment Information (Geographic Information, Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Nov. 01, 2015	Aug. 02, 2015	May 03, 2015	Feb. 01, 2015	Nov. 02, 2014	Jul. 31, 2016	Aug. 02, 2015	Aug. 03, 2014
Segment Reporting Information [Line Items]
Net sales	$ 1,687	$ 1,870	$ 2,201	$ 2,203	$ 1,693	$ 1,900	$ 2,234	$ 2,255	$ 7,961	$ 8,082	$ 8,268
UNITED STATES
Segment Reporting Information [Line Items]
Net sales									6,437	6,400	6,432
AUSTRALIA
Segment Reporting Information [Line Items]
Net sales									590	646	709
Other Countries [Member]
Segment Reporting Information [Line Items]
Net sales									$ 934	$ 1,036	$ 1,127