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INVESTMENTS - Net Investment Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Investment Income [Line Items]      
Gross investment income (loss) $ 4,428 $ 3,420 $ 3,923
Investment expenses (108) (105) (77)
Net investment income (loss) 4,320 3,315 3,846
Fixed maturities      
Net Investment Income [Line Items]      
Gross investment income (loss) 3,107 2,625 2,440
Mortgage loans on real estate      
Net Investment Income [Line Items]      
Gross investment income (loss) 806 587 546
Other equity investments      
Net Investment Income [Line Items]      
Gross investment income (loss) 77 134 609
Policy loans      
Net Investment Income [Line Items]      
Gross investment income (loss) 216 215 203
Trading securities      
Net Investment Income [Line Items]      
Gross investment income (loss) 110 (169) 73
Other investment income      
Net Investment Income [Line Items]      
Gross investment income (loss) 98 33 17
Fixed maturities, at fair value using the fair value option      
Net Investment Income [Line Items]      
Gross investment income (loss) $ 14 $ (5) $ 35