Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Schedule of Funds Held for Customers (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jul. 31, 2024	Jan. 31, 2024	Jul. 31, 2023
Cash And Cash Equivalents, Investments, And Funds Receivable And Amounts Held For Customers [Abstract]
Restricted cash and restricted cash equivalents	$ 2,907	$ 3,490	$ 2,967	$ 4
Restricted available-for-sale debt securities and funds receivable	427	431	423	416
Total funds receivable and amounts held for customers	$ 3,334	$ 3,921	$ 3,390	$ 420