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FAIR VALUE MEASUREMENTS - Rollforward of Level 3 Fair Value Measurements (Details) - Debt Securities
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance, beginning of year $ 200
Unrealized gains included in other comprehensive (loss) income 126 [1]
Balance, end of period $ 326
[1] Included in Net unrealized gains on available-for-sale securities in the Unaudited Consolidated Statements of Comprehensive Income (Loss).