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, 2023	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Amortized Cost
Cash and cash equivalents	$ 2,848	$ 2,796	$ 2,562
Investments	819	490
Funds receivable and amounts held for customers	424	435
Total cash and cash equivalents, investments, and funds receivable and amounts held for customers	4,091	3,721
Fair Value
Cash and cash equivalents	2,848	2,796
Investments	814	485
Funds receivable and amounts held for customers	420	431	$ 457	$ 455
Total cash and cash equivalents, investments, and funds receivable and amounts held for customers	$ 4,082	$ 3,712