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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, 2021 | Jul. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 419 | $ 389
Due within two years | 334 | 256
Due within three years | 390 | 137
Due after three years | 4 | 18
Total available-for-sale debt securities | 1,147 | 800
Fair Value |  |
Due within one year | 421 | 390
Due within two years | 336 | 261
Due within three years | 391 | 139
Due after three years | 4 | 18
Total available-for-sale debt securities | $ 1,152 | $ 808

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