Cash and Cash Equivalents, Investments, and Funds Held for Customers - Table of cash and cash equivalents, investments, and funds receivable and amounts held for customers by balance sheet classification (Details) - USD ($) $ in Millions	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Amortized Cost
Cash and cash equivalents	$ 2,796	$ 2,562	$ 6,442
Investments	694	1,504
Total cash and cash equivalents, investments, and funds held for customers	3,721	4,323
Fair Value
Cash and cash equivalents	2,796	2,562
Investments	685	1,508
Total cash and cash equivalents, investments, and funds held for customers	3,712	4,327
Investments
Amortized Cost
Investments	490	1,305
Fair Value
Investments	485	1,308
In funds receivable and amounts held for customers
Amortized Cost
Investments	435	456
Fair Value
Investments	$ 431	$ 457