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Derivative Instruments - Schedule of Notional Amounts of Derivatives Outstanding (Details) - USD ($)
Jul. 31, 2021
Jul. 25, 2020
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