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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Available-for-Sale Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Within one year	$ 1,091
After one year through five years	1,414
After five years	31
Amortized Cost	2,536	$ 2,501
Fair Value
Within one year	1,086
After one year through five years	1,397
After five years	31
Estimated Fair Value	$ 2,514	$ 2,497

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Debt Securities, Available-For-Sale, Amortized Cost, Maturity, Allocated And Single Maturity Date, After Year 5

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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), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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