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Available-for-Sale Debt and Equity Investments - Maturities of Fixed Income Securities (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 25, 2020
Amortized Cost
Within 1 year	$ 4,981
After 1 year through 5 years	6,517
After 5 years through 10 years	637
After 10 years	5
Mortgage-backed securities with no single maturity	2,838
Amortized Cost	14,978	$ 17,163
Fair Value
Within 1 year	4,976
After 1 year through 5 years	6,677
After 5 years through 10 years	685
After 10 years	6
Mortgage-backed securities with no single maturity	2,862
Fair Value	$ 15,206	$ 17,610

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