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Fair Value Measurements - Schedule of Cash Equivalents and Available-for-sale Debt and Equity Securities (Details) - USD ($)
$ in Millions
Jan. 31, 2026
Jul. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: $ 2,942 $ 2,884
Total available-for-sale debt securities 183 1,818
Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 318 1,790
Total available-for-sale debt securities 183 1,818
Fair value, measurements, recurring | Funds receivable and amounts held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 6 0
Fair value, measurements, recurring | In cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 312 1,790
Fair value, measurements, recurring | In investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale debt securities 33 1,668
Fair value, measurements, recurring | Funds receivable and amounts held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale debt securities 150 150
Fair value, measurements, recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 318 1,790
Total available-for-sale debt securities 0 0
Fair value, measurements, recurring | Level 1 | Funds receivable and amounts held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 6 0
Fair value, measurements, recurring | Level 1 | In cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 312 1,790
Fair value, measurements, recurring | Level 1 | In investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale debt securities 0 0
Fair value, measurements, recurring | Level 1 | Funds receivable and amounts held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale debt securities 0 0
Fair value, measurements, recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Total available-for-sale debt securities 183 1,818
Fair value, measurements, recurring | Level 2 | Funds receivable and amounts held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Fair value, measurements, recurring | Level 2 | In cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Fair value, measurements, recurring | Level 2 | In investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale debt securities 33 1,668
Fair value, measurements, recurring | Level 2 | Funds receivable and amounts held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale debt securities $ 150 $ 150