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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
Apr. 30, 2025
Jul. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt $ 6,406 $ 6,038
Long-term investments 88 131
Senior unsecured notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 5,500 5,500
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 5,400 $ 5,500
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cumulative upward adjustments to non-marketable equity securities 82  
Cumulative downward adjustments, including impairments $ 69