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Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-term investments | $ 84 |  | $ 43
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Upward adjustments to non-marketable equity securities | 46 | $ 8 |
Cumulative upward adjustments to non-marketable equity securities | $ 63 |  |

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