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Derivative Instruments - Effect of Derivative Instruments Designated as Fair Value Hedges and Underlying Hedged Items on Consolidated Statements of Operations (Details) - Derivatives Designated as Fair Value Hedging Instruments - Interest rate derivatives - Interest expense - USD ($) $ in Millions | 12 Months Ended
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Jul. 27, 2019 | Jul. 28, 2018 | Jul. 29, 2017
Hedge Underlying Gain Loss [Line Items] |  |  |
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED | $ 145 | $ (174) | $ (275)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED | $ (138) | $ 173 | $ 271

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- Definition Hedge Underlying Gain Loss [Line Items] + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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