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Derivative Instruments - Effect of Derivative Instruments Not Designated as Hedges on Consolidated Statements of Operations (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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May 01, 2021 | Apr. 25, 2020 | May 01, 2021 | Apr. 25, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gains (losses) | $ 38 | $ (157) | $ 198 | $ (120)
Foreign currency derivatives | Other income (loss), net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gains (losses) | (12) | (47) | 35 | (56)
Total return swaps—deferred compensation | Operating expenses and other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gains (losses) | 45 | (104) | 144 | (63)
Equity derivatives | Other income (loss), net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gains (losses) | $ 5 | $ (6) | $ 19 | $ (1)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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