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Derivative Instruments - Schedule of Notional Amounts of Derivatives Outstanding (Details) - USD ($) | Jul. 31, 2021 | Jul. 25, 2020
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Derivative [Line Items] |  |
Derivative notional amount | $ 6,869,000,000 | $ 7,395,000,000
Foreign currency derivatives |  |
Derivative [Line Items] |  |
Derivative notional amount | 4,139,000,000 | 4,315,000,000
Interest rate derivatives |  |
Derivative [Line Items] |  |
Derivative notional amount | 2,000,000,000 | 2,500,000,000
Total return swaps—deferred compensation |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 730,000,000 | $ 580,000,000

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