Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Table of cash and cash equivalents, investments, and relevant portion of funds receivable and amounts held for customers by investment type (Details) - USD ($) $ in Millions	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Amortized Cost
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 2,852	$ 2,997	$ 2,819	$ 6,697
Total available-for-sale debt securities	1,023	694
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments	3,875	3,691
Fair Value
Total available-for-sale debt securities	1,014	685
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments	3,866	3,682
Funds receivable and amounts held for customers not measured and recorded at fair value	216	30
Total cash, cash equivalents, restricted cash, and restricted cash equivalents
Amortized Cost
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	2,852	2,997
Fair Value
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	2,852	2,997
Corporate notes
Amortized Cost
Total available-for-sale debt securities	811	597
Fair Value
Total available-for-sale debt securities	805	589
U.S. agency securities
Amortized Cost
Total available-for-sale debt securities	212	97
Fair Value
Total available-for-sale debt securities	$ 209	$ 96