Business And Geographic Segment Information Business And Geographic Segment Information (Geographic Information, Net Sales) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 29, 2012	Apr. 29, 2012	Jan. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	May 01, 2011	Jan. 30, 2011	Oct. 31, 2010	Jul. 29, 2012	Jul. 31, 2011	Aug. 01, 2010
Segment Reporting Information [Line Items]
Net Sales, Total	$ 1,613	$ 1,821	$ 2,112	$ 2,161	$ 1,607	$ 1,813	$ 2,127	$ 2,172	$ 7,707	$ 7,719	$ 7,676
UNITED STATES
Segment Reporting Information [Line Items]
Net Sales									5,359	5,309	5,436
Australia/Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales									1,136	1,138	978
Europe [Member]
Segment Reporting Information [Line Items]
Net Sales									562	596	601
Other Countries [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 650	$ 676	$ 661