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Derivative Instruments (Effect Of Derivative Instruments Designated As Fair Value Hedges And Underlying Hedged Items On Consolidated Statements Of Operations Summary) (Details) (Derivatives Designated As Fair Value Hedging Instruments [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Oct. 26, 2013 | Oct. 27, 2012
Hedge Underlying Gain Loss [Line Items] |  |
Gains (losses) on derivative instruments | $ (17) | $ (21)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 15 | 21
Equity Contract [Member] | Other income (loss), net [Member] |  |
Hedge Underlying Gain Loss [Line Items] |  |
Gains (losses) on derivative instruments | (35) | (3)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 35 | 3
Interest Rate Contract [Member] | Interest Expense [Member] |  |
Hedge Underlying Gain Loss [Line Items] |  |
Gains (losses) on derivative instruments | 18 | (18)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | $ (20) | $ 18

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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 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 + Details
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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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