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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
Jan. 31, 2026
Jul. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt $ 6,160 $ 5,973
Long-term investments 127 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 $ 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 79  
Cumulative downward adjustments, including impairments $ 27