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Investments - Contractual Maturities of Investments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 1,025 |
Due after one year through five years | 799 |
Amortized Cost | 1,824 | $ 2,700
Estimated Fair Value |  |
Due in one year or less | 1,023 |
Due after one year through five years | 789 |
Estimated Fair Value | $ 1,812 |

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