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INVESTMENTS - Trading Securities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]      
Net investment gains (losses) recognized during the period on securities held at the end of the period $ 82 $ (198) $ (274)
Net investment gains (losses) recognized on securities sold during the period (5) 0 248
Unrealized and realized gains (losses) on trading securities 77 (198) (26)
Interest and dividend income from trading securities 33 29 99
Net investment income (loss) from trading securities $ 110 $ (169) $ 73