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FAIR VALUE MEASUREMENTS - Proceeds from the Sale of Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]      
Sale Proceeds $ 48 $ 186 $ 1,637
Realized Gains 0 12 98
Realized Losses (3) (8) (31)
Interest and Dividend Income $ 11 $ 22 $ 38