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Derivative Instruments - Schedule of Notional Amounts of Derivatives Outstanding (Details) - USD ($) $ in Millions | Jul. 27, 2019 | Jul. 28, 2018
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Derivative [Line Items] |  |
Derivative, notional amount | $ 8,754 | $ 10,011
Derivatives designated as hedging instruments | Foreign currency derivatives |  |
Derivative [Line Items] |  |
Derivative, notional amount | 663 | 147
Derivatives designated as hedging instruments | Interest rate derivatives |  |
Derivative [Line Items] |  |
Derivative, notional amount | 4,500 | 6,750
Derivatives designated as hedging instruments | Net investment hedging instruments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 309 | 250
Derivatives not designated as hedging instruments | Foreign currency derivatives |  |
Derivative [Line Items] |  |
Derivative, notional amount | 2,708 | 2,298
Derivatives not designated as hedging instruments | Total return swaps—deferred compensation |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 574 | $ 566

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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