Share-Based Compensation (Aggregate Intrinsic Value for Stock Options Outstanding and Exercisable) (Details) - USD ($) $ in Millions	Jul. 30, 2016	Aug. 01, 2015
Share-Based Compensation [Abstract]
Outstanding	$ 76	$ 173
Outstanding and exercisable	74	152
Vested and expected to vest	$ 76	$ 172

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding and Exercisable, Aggregate Intrinsic Value

No definition available.

+ Details

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- References

No definition available.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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