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Cash and Cash Equivalents, Investments, and Funds Held for Customers - Table of available-for-sale debt securities classified by maturity date (Details) - USD ($) $ in Millions | Jul. 31, 2021 | Jul. 31, 2020
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Amortized Cost |  |
Due within one year | $ 551 | $ 389
Due within two years | 550 | 256
Due within three years | 398 | 137
Due after three years | 5 | 18
Total available-for-sale debt securities | 1,504 | 800
Fair Value |  |
Due within one year | 553 | 390
Due within two years | 551 | 261
Due within three years | 398 | 139
Due after three years | 6 | 18
Total available-for-sale debt securities | $ 1,508 | $ 808

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