Cash and Cash Equivalents, Investments, and Funds Held for Customers - Table of available-for-sale debt securities classified by maturity date (Details) - USD ($) $ in Millions	Jul. 31, 2022	Jul. 31, 2021
Amortized Cost
Due within one year	$ 316	$ 551
Due within two years	298	550
Due within three years	79	398
Due after three years	1	5
Total available-for-sale debt securities	694	1,504
Fair Value
Due within one year	313	553
Due within two years	293	551
Due within three years	78	398
Due after three years	1	6
Total available-for-sale debt securities	$ 685	$ 1,508