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Fair Value Measurements - Schedule of Carrying Value of Our Long-Term Investments (Details) - Level 3 - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2026
Jan. 31, 2025
Jan. 31, 2026
Jan. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Upward adjustments $ 31,000,000 $ 8,000,000 $ 58,000,000 $ 8,000,000
Downward adjustments, including impairments 0 (9,000,000) 0 (51,000,000)
Net adjustments $ 31,000,000 $ (1,000,000) $ 58,000,000 $ (43,000,000)