Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Classification on Balance Sheets (Details) - USD ($) $ in Millions	Jan. 31, 2023	Jul. 31, 2022	Jan. 31, 2022
Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 1,547	$ 2,796	$ 1,257
Available-for-sale debt securities, amortized cost	734	694
Total cash and cash equivalents, investments, and funds held for customers, amortized cost	2,457	3,721
Cash equivalents:	1,547	2,796
Available-for-sale debt securities, fair value	724	685
Total cash and cash equivalents, investments, and funds held for customers, fair value	2,447	3,712
Investments
Cash and Cash Equivalents Items [Line Items]
Available-for-sale debt securities, amortized cost	529	490
Available-for-sale debt securities, fair value	524	485
Funds receivable and amounts held for customers
Cash and Cash Equivalents Items [Line Items]
Available-for-sale debt securities, amortized cost	381	435
Available-for-sale debt securities, fair value	$ 376	$ 431