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Available-for-Sale Debt Securities - Summary of Available-for-Sale Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost
Within one year	$ 1,522
After one year through five years	489
After five years	12
Amortized Cost	2,023	$ 16,499
Fair Value
Within one year	1,524
After one year through five years	490
After five years	12
Available-for-sale debt securities	$ 2,026	$ 16,500

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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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