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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, 2020 | Jul. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 386 | $ 415
Due within two years | 243 | 208
Due within three years | 146 | 163
Due after three years | 21 | 36
Total available-for-sale debt securities | 796 | 822
Fair Value |  |
Due within one year | 387 | 416
Due within two years | 245 | 208
Due within three years | 147 | 164
Due after three years | 21 | 36
Total available-for-sale debt securities | $ 800 | $ 824

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