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Available-for-Sale Debt Securities - Summary of Available-for-Sale Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Within one year	$ 11,420
After one year through five years	3,513
After five years	19
Amortized Cost	14,952	$ 16,499
Fair Value
Within one year	11,391
After one year through five years	3,510
After five years	19
Available-for-sale debt securities	$ 14,920	$ 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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