Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Table of available-for-sale debt securities classified by maturity date (Details) - USD ($) $ in Millions	Jul. 31, 2024	Jul. 31, 2023
Amortized Cost
Due within one year	$ 517	$ 735
Due within two years	55	147
Due within three years	43	141
Due after three years	0	0
Total available-for-sale debt securities	615	1,023
Fair Value
Due within one year	516	730
Due within two years	56	144
Due within three years	43	140
Due after three years	0	0
Total available-for-sale debt securities	$ 615	$ 1,014