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Available-for-Sale Debt and Equity Investments - Maturities of Fixed Income Securities (Details) - USD ($)
$ in Millions
Jul. 30, 2022
Jul. 31, 2021
Amortized Cost    
Within 1 year $ 3,273  
After 1 year through 5 years 6,946  
After 5 years through 10 years 111  
After 10 years 3  
Mortgage-backed securities with no single maturity 2,134  
Amortized Cost 12,467 $ 14,978
Fair Value    
Within 1 year 3,219  
After 1 year through 5 years 6,646  
After 5 years through 10 years 103  
After 10 years 3  
Mortgage-backed securities with no single maturity 1,976  
Fair Value $ 11,947 $ 15,206