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INVESTMENTS - Investment Gains (Losses), Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net Investment Income [Line Items]        
Investment gains (losses), net $ (1,170) $ (46) $ (1,255) $ (101)
RGA Reinsurance Company        
Net Investment Income [Line Items]        
Investment gains (losses), net 1,100   1,100  
Fixed maturities        
Net Investment Income [Line Items]        
Investment gains (losses), net (1,161) (27) (1,180) (54)
Mortgage loans on real estate        
Net Investment Income [Line Items]        
Investment gains (losses), net (9) (26) (77) (58)
Other        
Net Investment Income [Line Items]        
Investment gains (losses), net $ 0 $ 7 $ 2 $ 11