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Available-for-Sale Debt and Equity Investments - Maturities of Available-for-Sale Debt Investments (Details) - USD ($) $ in Millions	Oct. 30, 2021	Jul. 31, 2021
Amortized Cost
Within 1 year	$ 4,291
After 1 year through 5 years	8,013
After 5 years through 10 years	301
After 10 years	6
Mortgage-backed securities with no single maturity	2,790
Amortized Cost	15,401	$ 14,978
Fair Value
Within 1 year	4,281
After 1 year through 5 years	8,106
After 5 years through 10 years	326
After 10 years	7
Mortgage-backed securities with no single maturity	2,793
Fair Value	$ 15,513	$ 15,206

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