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Investments - Contractual Maturities of Available-for-Sale Investments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 193
Due after one year through five years	943
Due after five years through ten years	160
Due after ten years	425
Amortized Cost	1,721	$ 1,941
Estimated Fair Value
Due in one year or less	195
Due after one year through five years	975
Due after five years through ten years	165
Due after ten years	434
Estimated Fair Value	$ 1,769

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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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