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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, 2021
Jul. 31, 2020
Apr. 30, 2020
Jul. 31, 2019
Cash and Cash Equivalents, Investments and Funds Held for Customers [Abstract]        
Restricted cash and restricted cash equivalents $ 148 $ 255 $ 189 $ 236
Restricted available-for-sale debt securities 200 200 200 200
Total funds held for customers $ 348 $ 455 $ 389 $ 436