Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Classification on Balance Sheets (Details) - USD ($) $ in Millions	Oct. 31, 2022	Jul. 31, 2022	Oct. 31, 2021
Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 2,125	$ 2,796	$ 2,864
Available-for-sale debt securities, amortized cost	816	694
Total cash and cash equivalents, investments, and funds held for customers, amortized cost	3,209	3,721
Cash equivalents:	2,125	2,796
Available-for-sale debt securities, fair value	799	685
Total cash and cash equivalents, investments, and funds held for customers, fair value	3,192	3,712
Investments
Cash and Cash Equivalents Items [Line Items]
Available-for-sale debt securities, amortized cost	608	490
Available-for-sale debt securities, fair value	599	485
Funds receivable and amounts held for customers
Cash and Cash Equivalents Items [Line Items]
Available-for-sale debt securities, amortized cost	476	435
Available-for-sale debt securities, fair value	$ 468	$ 431