Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Schedule of Investment Category Type of Issue (Details) - USD ($)	Jan. 31, 2025	Jul. 31, 2024	Jan. 31, 2024	Jul. 31, 2023
Cash and Cash Equivalents Items [Line Items]
Funds receivable and funds held for customers not measured or recorded at fair value	$ 277,000,000	$ 281,000,000
Total cash, cash equivalents, restricted cash, and restricted cash equivalents, amortized cost	5,342,000,000	7,099,000,000	$ 4,441,000,000	$ 2,852,000,000
Available-for-sale debt securities:
Available-for-sale debt securities, amortized cost	174,000,000	615,000,000
Available-for-sale debt securities, fair value	174,000,000	615,000,000
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments, amortized cost	5,516,000,000	7,714,000,000
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments, fair value	5,516,000,000	7,714,000,000
Credit losses related to available-for-sale securities	0
Total cash, cash equivalents, restricted cash, and restricted cash equivalents
Cash and Cash Equivalents Items [Line Items]
Total cash, cash equivalents, restricted cash, and restricted cash equivalents, amortized cost	5,342,000,000	7,099,000,000
Total cash, cash equivalents, restricted cash, and restricted cash equivalents, fair value	5,342,000,000	7,099,000,000
Corporate notes
Available-for-sale debt securities:
Available-for-sale debt securities, amortized cost	158,000,000	456,000,000
Available-for-sale debt securities, fair value	159,000,000	456,000,000
U.S. agency securities
Available-for-sale debt securities:
Available-for-sale debt securities, amortized cost	16,000,000	159,000,000
Available-for-sale debt securities, fair value	$ 15,000,000	$ 159,000,000