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INVESTMENTS - Trading Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Net investment gains (losses) recognized during the period on securities held at the end of the period $ 49 $ 70 $ 82 $ 112
Net investment gains (losses) recognized on securities sold during the period 1 1 7 2
Unrealized and realized gains (losses) on trading securities 50 71 89 114
Interest and dividend income from trading securities 18 23 52 55
Net investment income (loss) from trading securities $ 68 $ 94 $ 141 $ 169