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INVESTMENTS - Trading Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Net investment gains (losses) recognized during the period on securities held at the end of the period $ 11 $ (108) $ 46 $ (202)
Net investment gains (losses) recognized on securities sold during the period (1) 4 (2) 6
Unrealized and realized gains (losses) on trading securities 10 (104) 44 (196)
Interest and dividend income from trading securities 7 2 12 18
Net investment income (loss) from trading securities $ 17 $ (102) $ 56 $ (178)