Cash and Cash Equivalents, Investments, and Funds Held for Customers - Classified by the stated maturity date (Details) - USD ($) $ in Millions	Oct. 31, 2021	Jul. 31, 2021
Amortized Cost
Due within one year	$ 154	$ 551
Due within two years	300	550
Due within three years	132	398
Due after three years	0	5
Total available-for-sale debt securities	586	1,504
Fair Value
Due within one year	154	553
Due within two years	299	551
Due within three years	131	398
Due after three years	0	6
Total available-for-sale debt securities	$ 584	$ 1,508