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INVESTMENTS - Trading Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Net investment gains (losses) recognized during the period on securities held at the end of the period $ 6 $ 11 $ 42 $ 46
Net investment gains (losses) recognized on securities sold during the period 0 (1) 1 (2)
Unrealized and realized gains (losses) on trading securities 6 10 43 44
Interest and dividend income from trading securities 21 7 32 12
Net investment income (loss) from trading securities $ 27 $ 17 $ 75 $ 56