Financial Instruments (Derivatives Designated As Fair-Value Hedges) (Details) - Interest Expense [Member] - Interest Rate Swap [Member] - USD ($) $ in Millions	12 Months Ended
Jul. 31, 2016	Aug. 02, 2015	Aug. 03, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	$ 0	$ 0	$ (1)
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	$ 0	$ 0	$ 1

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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