Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Investments in Funds Held for Customers (Details) - USD ($) $ in Millions	Oct. 31, 2023	Jul. 31, 2023	Oct. 31, 2022	Jul. 31, 2022
Cash And Cash Equivalents, Investments And Funds Held For Customers [Abstract]
Restricted cash and restricted cash equivalents	$ 2,063	$ 4	$ 15	$ 201
Restricted available-for-sale debt securities and funds receivable	462	416	453	230
Total funds receivable and amounts held for customers	$ 2,525	$ 420	$ 468	$ 431