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Investments - Contractual Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 474
Due after one year through five years	892
Due after five years through ten years	132
Due after ten years	328
Amortized Cost	1,826	$ 1,941
Estimated Fair Value
Due in one year or less	475
Due after one year through five years	926
Due after five years through ten years	137
Due after ten years	337
Estimated Fair Value	$ 1,875

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