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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, 2020 | Jul. 31, 2019
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Amortized Cost |  |
Due within one year | $ 389 | $ 415
Due within two years | 256 | 208
Due within three years | 137 | 163
Due after three years | 18 | 36
Total available-for-sale debt securities | 800 | 822
Fair Value |  |
Due within one year | 390 | 416
Due within two years | 261 | 208
Due within three years | 139 | 164
Due after three years | 18 | 36
Total available-for-sale debt securities | $ 808 | $ 824

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