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Investments - Contractual Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 1,000 |
Due after one year through five years | 692 |
Amortized Cost | 1,692 | $ 2,700
Estimated Fair Value |  |
Due in one year or less | 997 |
Due after one year through five years | 684 |
Estimated Fair Value | $ 1,681 |

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