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Derivative Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - Derivatives designated as hedging instruments - USD ($) $ in Millions | Jul. 31, 2021 | Jul. 25, 2020
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Short-term debt |  |
Derivative [Line Items] |  |
CARRYING AMOUNT OF THE HEDGED ASSETS/(LIABILITIES) | $ (508) | $ (506)
CUMULATIVE AMOUNT OF FAIR VALUE HEDGING ADJUSTMENT INCLUDED IN THE CARRYING AMOUNT OF THE HEDGED ASSETS/LIABILITIES | (9) | (6)
Long-term debt |  |
Derivative [Line Items] |  |
CARRYING AMOUNT OF THE HEDGED ASSETS/(LIABILITIES) | (1,594) | (2,159)
CUMULATIVE AMOUNT OF FAIR VALUE HEDGING ADJUSTMENT INCLUDED IN THE CARRYING AMOUNT OF THE HEDGED ASSETS/LIABILITIES | $ (97) | $ (165)

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- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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