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Cash and Cash Equivalents, Investments, and Funds Held for Customers - Classified by the stated maturity date (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Jul. 31, 2020
Amortized Cost    
Due within one year $ 419 $ 389
Due within two years 334 256
Due within three years 390 137
Due after three years 4 18
Total available-for-sale debt securities 1,147 800
Fair Value    
Due within one year 421 390
Due within two years 336 261
Due within three years 391 139
Due after three years 4 18
Total available-for-sale debt securities $ 1,152 $ 808