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, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Amortized Cost
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 7,099	$ 2,852	$ 2,997	$ 2,819
Total available-for-sale debt securities	615	1,023
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments	7,714	3,875
Fair Value
Total available-for-sale debt securities	615	1,014
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments	7,714	3,866
Funds receivable and amounts held for customers not measured and recorded at fair value	281	216
Total cash, cash equivalents, restricted cash, and restricted cash equivalents
Amortized Cost
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	7,099	2,852
Fair Value
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	7,099	2,852
Corporate notes
Amortized Cost
Total available-for-sale debt securities	456	811
Fair Value
Total available-for-sale debt securities	456	805
U.S. agency securities
Amortized Cost
Total available-for-sale debt securities	159	212
Fair Value
Total available-for-sale debt securities	$ 159	$ 209