v3.26.1
Fair Value Measurements - Schedule of Cash Equivalents and Available-for-sale Debt and Equity Securities (Details) - USD ($)
$ in Millions
Apr. 30, 2026
Jul. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: $ 4,681 $ 2,884
Total available-for-sale debt securities 2,249 1,818
Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 1,852 1,790
Total available-for-sale debt securities 2,249 1,818
Fair value, measurements, recurring | In cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 1,852 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 2,099 1,668
Fair value, measurements, recurring | In 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: 1,852 1,790
Total available-for-sale debt securities 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: 1,852 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 | In 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 2,249 1,818
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 2,099 1,668
Fair value, measurements, recurring | Level 2 | In 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