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INVESTMENTS - Trading Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Net investment gains (losses) recognized during the period on securities held at the end of the period $ 35 $ (94)
Net investment gains (losses) recognized on securities sold during the period (1) 2
Unrealized and realized gains (losses) on trading securities 34 (92)
Interest and dividend income from trading securities 5 16
Net investment income (loss) from trading securities $ 39 $ (76)