Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Investments in funds receivable and amounts held for customers (Details) - USD ($) $ in Millions	Jul. 31, 2026	Jul. 31, 2025	Jul. 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	$ 4,511	$ 6,597	$ 3,490	$ 4
Restricted available-for-sale debt securities	150	150	150	200
Restricted funds receivable	377	329	281	216
Total funds receivable and amounts held for customers	$ 5,038	$ 7,076	$ 3,921	$ 420

Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.