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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | Oct. 31, 2025 | Jul. 31, 2025
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | $ 6,140 | $ 5,973
Long-term investments | 92 | 94
Senior unsecured notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 5,000 | $ 5,000
Level 2 | Senior unsecured notes | Fair value, measurements, recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior unsecured notes | 5,000 |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cumulative upward adjustments to non-marketable equity securities | 48 |
Cumulative downward adjustments, including impairments | $ 27 |

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