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Balance Sheet and Other Details - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Jan. 29, 2022
Jul. 31, 2021
Jan. 23, 2021
Jul. 25, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 6,731 $ 9,175    
Restricted cash included in other current assets 11 14    
Restricted cash included in other assets 750 753    
Total cash, cash equivalents, and restricted cash $ 7,492 $ 9,942 $ 11,803 $ 11,812