Acquistions Pro forma Information (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Oct. 27, 2013	Oct. 28, 2012
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Revenue	$ 2,169	$ 2,299
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax	$ 182	$ 231
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.57	$ 0.73

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=25497992&loc=d3e1392-128463

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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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