Acquistions Pro forma Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Aug. 02, 2015	Aug. 03, 2014	Jul. 28, 2013
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Revenue	$ 8,174	$ 8,372	$ 8,327
Business Acquisition, Pro Forma Net Income (Loss)	$ 668	$ 789	$ 938
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 2.13	$ 2.50	$ 2.96

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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No definition available.

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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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