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INVESTMENTS - Trading Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Net investment gains (losses) recognized during the period on securities held at the end of the period $ 36 $ 35
Net investment gains (losses) recognized on securities sold during the period 1 (1)
Unrealized and realized gains (losses) on trading securities 37 34
Interest and dividend income from trading securities 11 5
Net investment income (loss) from trading securities $ 48 $ 39