Fair Value Measurements - Schedule of Cash Equivalents and Available-for-sale Debt and Equity Securities (Details) - USD ($) $ in Millions	Oct. 31, 2025	Jul. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	$ 3,506	$ 2,884
Total available-for-sale debt securities	340	1,818
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	2,330	1,790
Total available-for-sale debt securities	340	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:	2,330	1,790
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 | In investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale debt securities	190	1,668
Fair value, measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	2,330	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:	2,330	1,790
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 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	340	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 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	$ 190	$ 1,668