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Available-for-Sale Debt and Equity Investments - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 25, 2020
Schedule of Investments [Line Items] |  |
Net unrealized gains on marketable securities | $ 8 |
Net loss (gain) on non-marketable equity securities measured using the measurement alternative | (39) | $ 13
Investments in privately held companies | 1,500 |
Funding commitments | 200 |
Variable Interest Entity, Not Primary Beneficiary |  |
Schedule of Investments [Line Items] |  |
Investments in privately held companies | 900 |
Net Asset Value (NAV) | Private equity funds |  |
Schedule of Investments [Line Items] |  |
Non-marketable equity securities included in other assets | $ 900 | $ 700

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