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Fair Value Measurements - Schedule of carrying value of our long-term investments (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
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Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Upward adjustments | $ 11 | $ 4 | $ 0
Downward adjustments, including impairments | (51) | (2) | (6)
Net adjustments | $ (40) | $ 2 | $ (6)

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