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Cash and Cash Equivalents, Investments, and Funds Held for Customers - Investments in Funds Held for Customers (Details) - USD ($)
$ in Millions
Apr. 30, 2022
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2020
Cash And Cash Equivalents, Investments And Funds Held For Customers [Abstract]        
Restricted cash and restricted cash equivalents $ 339 $ 257 $ 148 $ 255
Restricted available-for-sale debt securities 200 200 200 200
Total funds held for customers $ 539 $ 457 $ 348 $ 455