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FAIR VALUE - Significant Unobservable Inputs (Level 3) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2022
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance at January 1 $ 68
Total gains or losses:  
Realized in earnings 0
Unrealized in other comprehensive income (10)
Purchases 44
Sales 0
Settlements 0
Balance at June 30 $ 102