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Cash and Cash Equivalents, Investments, and Funds Held for Customers - Classified by the stated maturity date (Details) - USD ($)
$ in Millions
Jan. 31, 2022
Jul. 31, 2021
Amortized Cost    
Due within one year $ 102 $ 551
Due within two years 189 550
Due within three years 68 398
Due after three years 1 5
Total available-for-sale debt securities 360 1,504
Fair Value    
Due within one year 102 553
Due within two years 187 551
Due within three years 66 398
Due after three years 1 6
Total available-for-sale debt securities $ 356 $ 1,508