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