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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, 2020 | Jul. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 397 | $ 415
Due within two years | 216 | 208
Due within three years | 177 | 163
Due after three years | 31 | 36
Total available-for-sale debt securities | 821 | 822
Fair Value |  |
Due within one year | 397 | 416
Due within two years | 218 | 208
Due within three years | 178 | 164
Due after three years | 32 | 36
Total available-for-sale debt securities | $ 825 | $ 824

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