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FAIR VALUE MEASUREMENTS - Proceeds from the Sale of Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]      
Sale Proceeds $ 186 $ 1,637 $ 800
Realized Gains 12 98 41
Realized Losses (8) (31) (48)
Interest and Dividend Income $ 22 $ 38 $ 41