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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, 2021	Dec. 31, 2020
Amortized Cost
Within one year	$ 1,898
After one year through five years	563
After five years	17
Amortized Cost	2,478	$ 2,023
Fair Value
Within one year	1,899
After one year through five years	562
After five years	17
Total	$ 2,478	$ 2,026

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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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