FAIR VALUE MEASUREMENTS - Fair Value Recurring Level 3 Rollforward (Details) - Debt Securities $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of year	$ 200
Unrealized gains	265	[1]
Transfers out of Level 3	(465)
Balance, end of year	$ 0

[1] During the year ended December 31, 2021, as a result of the Grab Transaction, the Company’s investment in Grab was reclassified as equity securities with readily determinable fair values (see Note 5).