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INVESTMENTS - Equity Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
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 $ (1) $ 19
Net investment gains (losses) recognized on securities sold during the period (3) 1
Unrealized and realized gains (losses) on equity securities $ (4) $ 20