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Investments - Contractual Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 665 |
Due after one year through five years | 1,667 |
Due after five years through ten years | 335 |
Due after ten years | 541 |
Amortized Cost | 3,208 | $ 1,826
Estimated Fair Value |  |
Due in one year or less | 667 |
Due after one year through five years | 1,662 |
Due after five years through ten years | 335 |
Due after ten years | 538 |
Amortized Cost | $ 3,202 | $ 1,875

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