Fair Value Measurements - Schedule of Cash Equivalents and Available-for-sale Debt and Equity Securities (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jul. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	$ 2,435	$ 3,609
Total available-for-sale debt securities	174	615
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	1,193	2,538
Total available-for-sale debt securities	174	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:	22	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:	1,171	2,538
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	24	465
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:	1,193	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:	22	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:	1,171	2,538
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	174	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 | In investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale debt securities	24	465
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