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Fair Value Measurements - Schedule of Cash Equivalents and Available-for-sale Debt and Equity Securities (Details) - USD ($)
$ in Millions
Apr. 30, 2025
Jul. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: $ 5,443 $ 3,609
Total available-for-sale debt securities 881 615
Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 3,692 2,538
Total available-for-sale debt securities 881 615
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: 0 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: 3,692 2,538
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 | In investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale debt securities 731 465
Fair value, measurements, recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 3,692 2,538
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: 0 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: 3,692 2,538
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 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 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Total available-for-sale debt securities 881 615
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 | 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 2 | In investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale debt securities $ 731 $ 465