Cash and Cash Equivalents, Investments, and Funds Held for Customers - Table of cash and cash equivalents, investments, and relevant portion of funds receivable and amounts held for customers by investment type (Details) - USD ($) $ in Millions	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Amortized Cost
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 2,997	$ 2,819	$ 6,697	$ 2,352
Total available-for-sale debt securities	694	1,504
Total cash and cash equivalents, investments, and funds held for customers	3,691	4,323
Fair Value
Total available-for-sale debt securities	685	1,508
Total cash and cash equivalents, investments, and funds held for customers	3,682	4,327
Funds receivable and amounts held for customers not measured or recorded at fair value
Amortized Cost
Total available-for-sale debt securities	30
Total cash, cash equivalents, restricted cash, and restricted cash equivalents
Amortized Cost
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	2,997	2,819
Fair Value
Total cash and cash equivalents	2,997	2,819
Total available-for-sale debt securities
Amortized Cost
Total available-for-sale debt securities	694	1,504
Fair Value
Total available-for-sale debt securities	685	1,508
Municipal bonds
Amortized Cost
Total available-for-sale debt securities	0	37
Fair Value
Total available-for-sale debt securities	0	38
Corporate notes
Amortized Cost
Total available-for-sale debt securities	597	1,397
Fair Value
Total available-for-sale debt securities	589	1,400
U.S. agency securities
Amortized Cost
Total available-for-sale debt securities	97	70
Fair Value
Total available-for-sale debt securities	$ 96	$ 70