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INVESTMENTS - Trading Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]        
Net investment gains (losses) recognized during the period on securities held at the end of the period $ (44) $ (57) $ (246) $ (303)
Net investment gains (losses) recognized on securities sold during the period 0 42 6 255
Unrealized and realized gains (losses) on trading securities (44) (15) (240) (48)
Interest and dividend income from trading securities 2 4 20 85
Net investment income (loss) from trading securities $ (42) $ (11) $ (220) $ 37