Business And Geographic Segment Information Business And Geographic Segment Information (Geographic Information, Long-lived Assets) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Aug. 02, 2015	Aug. 03, 2014
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	$ 2,407	$ 2,347	$ 2,318
UNITED STATES
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	1,967	1,942	1,844
AUSTRALIA
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	242	232	306
Other Countries [Member]
Segment Reporting Information [Line Items]
Plant assets, net of depreciation	$ 198	$ 173	$ 168

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 8
-Article 7

Name:	us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant