Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Type of Issue (Details) - USD ($) $ in Millions	Oct. 31, 2022	Jul. 31, 2022	Oct. 31, 2021	Jul. 31, 2021
Cash and Cash Equivalents Items [Line Items]
Total cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period	$ 2,140	$ 2,997	$ 2,972	$ 2,819
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	816	694
Available-for-sale debt securities, fair value	799	685
Total cash and cash equivalents, investments, and funds held for customers, amortized cost	3,209	3,721
Total cash and cash equivalents, investments, and funds held for customers, fair value	3,192	3,712
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments, Amortized Cost	2,956	3,691
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments, Fair Value	2,939	3,682
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 at end of period	2,140	2,997
Cash, cash equivalents, restricted cash, and restricted cash equivalents, fair value	2,140	2,997
Municipal bonds
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	0	0
Available-for-sale debt securities, fair value	0	0
Corporate notes
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	697	597
Available-for-sale debt securities, fair value	684	589
U.S. agency securities
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	119	97
Available-for-sale debt securities, fair value	115	96
Funds Receivable And Funds Held For Customers Not Measured Or Recorded At Fair Value
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	$ 253	$ 30