Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Table of cash and cash equivalents, investments, and funds receivable and amounts held for customers by balance sheet classification (Details) - USD ($) $ in Millions	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Amortized Cost
Cash and cash equivalents	$ 3,609	$ 2,848	$ 2,796
Investments	465	819
Funds receivable and amounts held for customers	3,921	424
Total cash and cash equivalents, investments, and funds receivable and amounts held for customers	7,995	4,091
Fair Value
Cash and cash equivalents	3,609	2,848
Investments	465	814
Funds receivable and amounts held for customers	3,921	420	$ 431	$ 457
Total cash and cash equivalents, investments, and funds receivable and amounts held for customers	$ 7,995	$ 4,082