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Investments - Contractual Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 453 |
Due after one year through five years | 957 |
Due after five years through ten years | 171 |
Due after ten years | 360 |
Amortized Cost | 1,941 | $ 1,692
Estimated Fair Value |  |
Due in one year or less | 453 |
Due after one year through five years | 962 |
Due after five years through ten years | 171 |
Due after ten years | 360 |
Estimated Fair Value | $ 1,946 |

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