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INVESTMENTS - Net Investment Income (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]        
Gross investment income (loss) $ 1,387 $ 1,343 $ 4,066 $ 3,779
Investment expenses (44) (35) (120) (94)
Net investment income (loss) 1,343 1,308 3,946 3,685
Fixed maturities        
Net Investment Income [Line Items]        
Gross investment income (loss) 922 896 2,796 2,551
Mortgage loans on real estate        
Net Investment Income [Line Items]        
Gross investment income (loss) 270 245 786 718
Other equity investments        
Net Investment Income [Line Items]        
Gross investment income (loss) 64 68 147 120
Policy loans        
Net Investment Income [Line Items]        
Gross investment income (loss) 35 57 142 167
Trading securities        
Net Investment Income [Line Items]        
Gross investment income (loss) 68 94 141 169
Other investment income        
Net Investment Income [Line Items]        
Gross investment income (loss) 16 (15) 33 30
Fixed maturities, at fair value using the fair value option        
Net Investment Income [Line Items]        
Gross investment income (loss) $ 12 $ (2) $ 21 $ 24