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Investments - Contractual Maturities of Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 263
Due after one year through five years	979
Due after five years through ten years	172
Due after ten years	450
Amortized Cost	1,864	$ 1,941
Estimated Fair Value
Due in one year or less	265
Due after one year through five years	1,009
Due after five years through ten years	176
Due after ten years	456
Estimated Fair Value	$ 1,906

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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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