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INVESTMENTS - Net Investment Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net Investment Income [Line Items]      
Gross investment income (loss) $ 3,420 $ 3,923 $ 3,549
Investment expenses (105) (77) (72)
Net investment income (loss) 3,315 3,846 3,477
Fixed maturities      
Net Investment Income [Line Items]      
Gross investment income (loss) 2,625 2,440 2,341
Mortgage loans on real estate      
Net Investment Income [Line Items]      
Gross investment income (loss) 587 546 516
Other equity investments      
Net Investment Income [Line Items]      
Gross investment income (loss) 134 609 67
Policy loans      
Net Investment Income [Line Items]      
Gross investment income (loss) 215 203 204
Trading securities      
Net Investment Income [Line Items]      
Gross investment income (loss) (169) 73 387
Other investment income      
Net Investment Income [Line Items]      
Gross investment income (loss) 33 17 33
Fixed maturities, at fair value using the fair value option      
Net Investment Income [Line Items]      
Gross investment income (loss) $ (5) $ 35 $ 1