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INVESTMENTS - Investment Gains (Losses), Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Investment Income [Line Items]      
Investment gains (losses), net $ (713) $ (945) $ 868
Fixed maturities      
Net Investment Income [Line Items]      
Investment gains (losses), net (563) (868) 847
Mortgage loans on real estate      
Net Investment Income [Line Items]      
Investment gains (losses), net (151) (66) 19
Other equity investments      
Net Investment Income [Line Items]      
Investment gains (losses), net 0 0 0
Other      
Net Investment Income [Line Items]      
Investment gains (losses), net $ 1 $ (11) $ 2