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INVESTMENTS - Trading Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Net investment gains (losses) recognized during the period on securities held at the end of the period $ (17) $ 36
Net investment gains (losses) recognized on securities sold during the period 16 1
Unrealized and realized gains (losses) on trading securities (1) 37
Interest and dividend income from trading securities 9 11
Net investment income (loss) from trading securities $ 8 $ 48