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AVAILABLE-FOR-SALE DEBT SECURITIES - Summary of Available-for-Sale Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Within one year	$ 1,390
After one year through five years	1,075
After five years	24
Amortized Cost	2,489	$ 2,023
Fair Value
Within one year	1,390
After one year through five years	1,075
After five years	24
Total	$ 2,489	$ 2,026

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