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Investments - Contractual Maturities of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 375
Due after one year through five years	1,032
Due after five years through ten years	183
Due after ten years	440
Amortized Cost	2,030	$ 1,941
Estimated Fair Value
Due in one year or less	375
Due after one year through five years	1,017
Due after five years through ten years	181
Due after ten years	437
Estimated Fair Value	$ 2,010

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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