Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Investments in Funds Held for Customers (Details) - USD ($) $ in Millions	Jan. 31, 2024	Jul. 31, 2023	Jan. 31, 2023	Jul. 31, 2022
Cash And Cash Equivalents, Investments, And Funds Receivable And Amounts Held For Customers [Abstract]
Restricted cash and restricted cash equivalents	$ 2,967	$ 4	$ 2	$ 201
Restricted available-for-sale debt securities and funds receivable	423	416	374	230
Total funds receivable and amounts held for customers	$ 3,390	$ 420	$ 376	$ 431