Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Investments in funds receivable and amounts held for customers (Details) - USD ($) $ in Millions	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers [Abstract]
Restricted cash and restricted cash equivalents	$ 3,490	$ 4	$ 201	$ 257
Restricted available-for-sale debt securities and funds receivable	431	416	230	200
Total funds receivable and amounts held for customers	$ 3,921	$ 420	$ 431	$ 457