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Available-for-Sale Debt and Equity Investments - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 29, 2022 | Jan. 29, 2022 | Jul. 31, 2021
Schedule of Investments [Line Items] |  |  |
Net unrealized gains (losses) on marketable securities | $ (18) | $ (13) |
Net loss (gain) on non-marketable equity securities measured using the measurement alternative | (14) | (16) |
Investments in privately held companies | 1,800 | 1,800 | $ 1,500
Funding commitments | 400 | 400 |
Variable Interest Entity, Not Primary Beneficiary |  |  |
Schedule of Investments [Line Items] |  |  |
Investments in privately held companies | 1,100 | 1,100 |
Private equity funds | Fair value measured at NAV per share |  |  |
Schedule of Investments [Line Items] |  |  |
Equity interests held in certain private equity funds | $ 1,100 | $ 1,100 | $ 900

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